JP5153368B2 - T-type joint penetration welding method and penetration welded structure - Google Patents

Description

  The present invention relates to a T-type joint penetration welding method and a penetration welded structure in which an upper plate is welded to a lower vertical plate upper surface.

  There has been proposed a T-type joint penetration welding method using a high energy density electron beam or laser beam.

  For example, in the through-welding method for a T-shaped joint described in Patent Document 1, a surface in contact with the upper plate of the lower plate is formed in a concave shape, and an electron beam is irradiated from the upper plate surface so that the weld metal of the upper plate is formed into the concave shape. It is disclosed to take part.

  In the welding method described in Patent Document 2 and a structure joined using the welding method, a joint part of another member is brought into contact with a member having a substantially plate-like part serving as a joint part for the body frame, and the other It is disclosed that through welding processing is performed using a predetermined through welding means (laser welding means, electron beam welding means) from a member surface opposite to the surface with which the member contacts.

  In the hollow material described in Patent Document 3 and the manufacturing method thereof, a solid extruded shape having a cross-sectional comb shape, a plate material facing the comb teeth of the solid shape, and a tip portion of the comb teeth of the solid shape And a welded portion for welding a contact portion with the plate material. Further, it is disclosed that a plate material is placed facing the comb tooth portion of the solid shape member, and a contact portion between the tip portion of the comb shape portion of the solid shape member and the plate material is welded.

  On the other hand, a deep penetration TIG welding method using a flux cored wire is disclosed.

  For example, in the TIG welding method described in Patent Document 4, a flux-cored wire containing a flux containing 6% by mass or more of a metal oxide is used as a filler material, and 0.05% of the metal oxide is contained in the molten metal. It is disclosed that TIG welding is performed while supplying -3 g / min.

In the flux-cored wire for TIG welding described in Patent Document 5, the flux is composed of SiO ₂ and Cr ₂ O _3, and the mixing ratio is 20 to 80 wt% for SiO _{2 and} 20 to 20 for Cr ₂ O ₃ . It is disclosed that the flux is filled in the flux-cored wire at a ratio of 5 to 25% by weight.

  In the TIG welding method described in Patent Document 6, it is disclosed that an arc is generated on the center line of the second member on the groove front side of the first member and welding is performed while an alternating magnetic field is applied to the welded portion.

  In the TIG welding apparatus and method described in Patent Document 7, the first shield gas made of an inert gas is caused to flow toward the work piece so as to surround the electrode, and on the peripheral side of the first shield gas, It is disclosed that a second shield gas containing an oxidizing gas is flowed toward a workpiece to be welded so that the oxygen concentration of the weld metal part is in the range of 70 to 220 wt.ppm. Patent Document 7 discloses the relationship between the oxygen concentration or carbon dioxide concentration of the second shield gas and the melting width and depth of the weld metal part.

  Patent Document 8 discloses forming a T joint by friction stir welding. That is, in Patent Document 7, a groove is provided on the lower surface of the first workpiece, the second workpiece is fitted into the groove, and the friction stir probe is applied from the upper surface side of the first workpiece to reach the meat of the second workpiece. , Forming a T joint by friction stir welding of a first work and a second work is disclosed.

JP-A-63-203286 (particularly, page 2, upper left column, line 16 to page upper right column, line 4, FIG. 1) JP 2003-334680 A (in particular, paragraphs 0029 and 0030, FIG. 3) Japanese Patent Laid-Open No. 6-23451 (particularly, paragraphs 0007 to 0010, FIGS. 1 and 2) JP 2001-219274 A (particularly paragraphs 0009 and 0010) JP 2001-1183 A (particularly paragraphs 0006 to 0008) JP 59-13577 (particularly, page 1, lower right column, lines 4-17, FIG. 1) JP 2004-298963 A (in particular, paragraphs 0014 to 0016, FIGS. 1, 11, and 15) JP 11-28581 A (particularly paragraphs 0012 to 0014, FIGS. 1 and 2)

  However, according to the technical idea disclosed in Patent Document 1, the upper plate is easily melted and penetrated to the lower plate side by electron beam welding for a thick T-shaped joint member which is difficult in the conventional welding process. Although it can be melt-bonded, special environmental equipment such as a vacuum device that excludes the atmosphere and a large vacuum chamber that accommodates the member to be welded is required, and there is a problem that the manufacturing cost increases with new capital investment. Moreover, in patent document 1, penetration welding by an electron beam becomes a keyhole-type penetration shape, and since the melting width is extremely narrow, the welding cross-sectional area is small and only a strength lower than the plate thickness strength of the member can be obtained. Keyhole type penetration welding has the problem that spatter (spattering of molten metal) is also likely to occur.

  According to the technical idea disclosed in Patent Document 2, the upper plate-like member and the lower side are subjected to through welding by laser welding or electron beam welding for a vehicle body frame having a joint structure that is difficult with conventional arc welding. The members are melt-bonded. In particular, laser welding is a welding method that is completely different from arc welding, and the above-mentioned through-welding is possible because the member is irradiated with a laser beam focused and optically densified by an optical lens or the like to melt. Because it is a keyhole-type penetration shape and the melt width is narrow, the weld cross-sectional area correlated with the weld strength tends to be small. Also, spatter is likely to occur during welding. No additive wire or flux-cored wire is used for this laser welding. Furthermore, laser welding requires special equipment such as a laser transmitter, and, like electron beam welding, both are expensive compared to inexpensive arc welding equipment. Patent Document 2 stipulates that electron beam welding can be performed in the same manner as the laser welding, but requires special environmental equipment such as a vacuum device that excludes the atmosphere and a vacuum chamber that houses a member to be welded. Therefore, it takes time for preparation before welding and unloading after welding, and it is not suitable for welding in a complicated shape that requires movement and rotation of the welded part.

  According to the technical idea disclosed in Patent Document 3, the contact portion (T-type joint portion) between the tip portion of the comb-shaped portion of the solid shape member and the plate member is mainly welded by laser welding. However, the hollow material to be welded is an aluminum alloy, which is completely different in material, characteristics and melting point from stainless steel and low carbon steel. Patent Document 3 describes that MIG welding or TIG welding may be used instead of laser welding, but TIG welding is not particularly used in any of the examples. In MIG welding, a hole is provided in the upper plate in advance in order to melt and bond to the lower comb tooth portion, and the lower comb tooth portion is plug welded (MIG arc spot welding) from this hole portion. To join. Further, in the laser welding described in Patent Document 3, since the member is irradiated with a laser beam condensed and increased in energy density by an optical lens or the like to melt, penetration welding to the lower comb tooth portion is possible. However, since it is a keyhole-type penetration shape and the melt width is narrow, the weld cross-sectional area correlated with the welding strength tends to be small. No additive wire or flux-cored wire is used for this laser welding.

  In the technical idea disclosed in Patent Document 4, a deep penetration portion is obtained by TIG welding while supplying a predetermined amount of a flux-cored wire containing 6% or more of a metal oxide. In particular, the measurement results of the penetration depth of a weld test of an I-type butt joint with a plate thickness of 9 mm are shown. However, there is a problem that the penetration depth and the wire melting state vary greatly depending on the increase / decrease of the feeding amount of the flux-cored wire and the feeding direction. Patent Document 4 discloses a test result of one-side penetration welding from the surface side of the I-type butt joint, but it is also assumed to be applied to penetration welding of a T-type joint having a shape different from that of a flat plate or an I-type butt joint. In contrast, the present invention is completely different from the present invention, and there is no disclosure or suggestion regarding penetration welding of a T-type joint.

According to the technical idea disclosed in Patent Document 5, a deep penetration portion is obtained by using a flux-cored wire in which a flux composed of SiO ₂ and Cr ₂ O ₃ is filled at a ratio of 5 to 25% by weight. I am doing so. However, as in the case of Patent Document 3, there is a problem that the penetration depth and the wire melting state vary greatly depending on the increase / decrease of the feeding amount of the flux-cored wire and the feeding direction. Further, Patent Document 5 discloses a test result of bead-on-plate welding to a flat plate of 8 mm thick stainless steel, but suggests application to welding of an I-type joint. It is not supposed to be applied to through welding of T-shaped joints having different shapes, and completely different from the present invention, and there is no disclosure or suggestion regarding through welding of T-shaped joints.

  According to the technical idea disclosed in Patent Document 6, the melted portion is stirred while applying an alternating magnetic field during arc welding to form back beads on the left and right back portions of the T-shaped joint. Is provided with a groove-like groove, and a multi-pass welding process is required for laminating up to the upper part of the groove, which is complicated. Moreover, in patent document 6, it is necessary to use a special alternating magnetic field apparatus in order to give an alternating magnetic field, and there exists a problem that manufacturing cost rises with new capital investment.

In the technical idea disclosed in Patent Document 7, a mixed gas of an oxidizing gas (O ₂ gas or CO ₂ gas) and an inert gas (Ar gas) is allowed to flow through the arc welding portion to increase the penetration depth. However, at that time, flux-cored wire is not used. Further, Patent Document 7 discloses the relationship between the oxygen concentration or carbon dioxide concentration of the second shield gas and the melting width and depth of the weld metal part, but on a flat plate different from the penetration result of the T-shaped joint. This is a melting result and is completely different from the present invention. There is no disclosure or suggestion regarding penetration welding of T-shaped joints or welding of butt joints.

  According to the technical idea disclosed in Patent Document 8, the formation of the T-shaped joint is achieved by the friction stir welding method. This friction stir welding method does not melt the material and is in a softened state with one workpiece. The arc welding according to the present invention is basically different from the other workpiece in that the one workpiece and the other workpiece are joined in a molten state in which the material is melted. That is, in the friction stir welding method, a friction stir probe is inserted to friction stir weld an aluminum joint material of a low melting point material, and the aluminum joint material is solid-phase joined (below the melting point using the probe). In contrast, arc welding according to the present invention uses high-melting-point stainless steel or low-carbon steel joint materials using the thermal energy of the arc. The joining method and joining state are completely different. Furthermore, in the friction stir welding method, a welding wire (for example, a flux-cored wire or a solid wire) cannot be fed or welded from the outside at all.

  The present invention has been made in consideration of various aspects of the above-described technology, and eliminates the need for groove grooves and joint gaps formed on the upper plate side, and lowers the lower side by one-pass welding performed from the upper plate surface side. An object of the present invention is to provide a through-welding method and a through-welding structure for a T-type joint effective for obtaining a sound weld metal part that is reliably melt-bonded to the vertical plate side, and sufficient welding strength.

  In order to achieve the above object, the present invention is a T-shaped joint made of stainless steel or low carbon steel, and the thickness T1 range of the upper plate is 2 <T1 ≦ 6 mm, In a through-welding method for a T-type joint that melts and joins from the upper plate surface that is placed one on the upper surface of the thicker plate or the upper plate surface that is placed in parallel to the lower plate, A non-consumable electrode type arc welding is performed by using a shielding gas supply means that flows out the shielding gas of the active gas, and at the same time, a flux-cored wire filled with a flux agent promoting penetration depth is supplied to the arc welding part. While melting to the lower vertical plate, at least the melt width w on the vertical plate side after penetrating the upper plate back surface is larger than the plate thickness T1 (w> T1), Weld cutting of the melt width part on the vertical plate side The area A is formed larger than the plate thickness sectional area B1 on the upper plate side (A> B1).

  Further, the present invention is a T-shaped joint made of stainless steel or low carbon steel, and the upper plate has a thickness T1 range of 2 <T1 ≦ 6 mm, which is thicker than the upper plate. In a through-welding method for a T-type joint that melts and joins from the upper plate surface arranged on the upper surface of the plate or the upper plate surface arranged in parallel to each other to the lower vertical plate, an inert gas shielding gas and A non-consumable electrode type arc welding is performed using a double shield gas supply means that flows out a shielding gas containing an oxidizing gas, and at the same time, a flux-cored wire filled with a flux agent promoting penetration depth is arced. The lower plate is melted while being fed to the welded portion, and at least the melt width w on the vertical plate side after penetrating the back surface of the upper plate is made larger than the plate thickness T1 (w> T1), or the upper plate The penetration part on the back side or the melting on the vertical plate side The weld cross-sectional area A of the width portion is formed larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1).

  In order to achieve the above object, the present invention is a T-shaped joint made of stainless steel or low carbon steel, and the upper plate has a thickness T1 range of 2 <T1 ≦ 6 mm. In a through-welding method for a T-type joint that melts and joins from the upper plate surface that is placed on the upper surface of the standing plate that is thicker than the plate thickness, or from the upper plate surface that is butt arranged in parallel to the lower plate to the lower standing plate , A first step of manufacturing a T-joint by arranging one or two upper plates that are thinner than the thickness of the standing plate on the upper surface of the lower plate, or abutting them in parallel, and shielding of an inert gas While performing non-consumable electrode type arc welding using shield gas supply means that flows out gas, the lower side while feeding a flux cored wire filled with a flux agent that promotes penetration depth to the arc welding part Melted or inactivated While performing the arc welding of the non-consumable electrode method using the double shield gas supply means that flows out the gas shielding gas and the shielding gas containing the oxidizing gas, while feeding the flux-cored wire to the arc welding portion Melting up to the lower plate, forming at least the melt width w on the vertical plate side after penetrating the upper plate back surface larger than the plate thickness T1 (w> T1), or penetrating part or vertical plate on the upper plate back surface Forming the welding cross-sectional area A of the melt width side on the side larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1), or setting both the melt width w and the weld cross-sectional area A to w> T1 and A> B1 And a second step of forming the size.

  In particular, when two upper plates in the range of the plate thickness T1 are butt-arranged in parallel on the upper surface of the thick plate, the plate thickness T1 of the upper plate is present even when there is almost no gap G in the butt portion. Is set to a small gap G range (0 ≦ G ≦ 0.2 × T 1) that is 0.2 times or less, and then the shield gas supply means for flowing out the inert gas shield gas, or the inert gas Performs non-consumable electrode type arc welding using double shield gas supply means that flows out shield gas and shield gas containing oxidizing gas, and at the same time contains flux filled with flux agent that promotes penetration depth Melting the wire up to the lower vertical plate while feeding the wire to the arc welded portion, forming at least the melt width w to a size of w> T1, or forming the weld cross section A to a size of A> B1, Or the melting width w and Both of the weld cross-sectional areas A are preferably formed in the size of w> T1 and A> B1.

  In order to achieve the above object, the present invention is a T-shaped joint made of stainless steel or low carbon steel, and the upper plate has a thickness T1 range of 2 <T1 ≦ 6 mm. In a through-welding method for a T-type joint that melts and joins from the upper plate surface that is placed on the upper surface of the standing plate that is thicker than the plate thickness, or from the upper plate surface that is butt arranged in parallel to the lower plate to the lower standing plate The laser torch is arranged so that the focal position of the laser beam irradiated to the place to be welded is shifted to the upper side from the surface of the upper plate. Melting up to the lower vertical plate while feeding to the welded portion, forming at least the melt width w on the vertical plate side after passing through the upper plate rear surface larger than the plate thickness T1 (w> T1), or the upper plate rear surface Melting on the penetrating part or standing plate side Forming the weld cross-sectional area A of the width portion larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1), or setting both the melt width w and the weld cross-sectional area A to w> T1 and A> B1 It is characterized by forming in.

  Further, the melt width w on the vertical plate side is formed larger than the plate thickness T1 of the upper plate (w> T1), and at the same time, the bead surface height C on the upper plate side is 1 to 3 mm higher than the upper plate surface (1 ≦ 1). C ≦ 3 mm) to form a convex shape.

  Furthermore, the plate thickness T2 range of the upright plate may be set to 2.5 times or more and 5 times or less (2.5 × T1 ≦ T2 ≦ 5 × T1) of the plate thickness T1 of the upper plate.

  In order to achieve the above object, the present invention is a T-shaped joint made of stainless steel or low carbon steel, and the upper plate has a thickness T1 range of 2 <T1 ≦ 6 mm. Through-weld structure of T-type joint that is melt-bonded from the upper plate surface that is placed on the upper surface of the standing plate that is thicker than the plate thickness, or from the upper plate surface that is butt arranged in parallel to the lower standing plate In this case, a non-consumable electrode type arc using a shield gas supply means for flowing out an inert gas shield gas or a double shield gas supply means for flowing out an inert gas shield gas and a shield gas containing an oxidizing gas. At the same time as welding is performed, a flux cored wire filled with a flux agent that promotes penetration depth is melted to the lower vertical plate while being fed to the arc welding part, and at least the vertical plate side after passing through the upper plate back surface of The width w is made larger than the plate thickness T1 of the upper plate (w> T1), or the weld cross section A of the penetration portion on the back surface of the upper plate or the melt width portion on the vertical plate side is determined from the plate thickness cross sectional area B1 on the upper plate side. A large (A> B1) formation or a structure including a weld metal portion in which both the melt width w and the weld cross-sectional area A are formed in the size of w> T1 and A> B1 is provided.

  Further, the melt width w on the vertical plate side is formed larger than the plate thickness T1 of the upper plate (w> T1), and at the same time, the bead surface height C on the upper plate side is 1 to 3 mm higher than the upper plate surface (1 ≦ 1). (C <= 3mm) It can also be set as the structure provided with the weld metal part formed and made convex shape.

  Furthermore, the weld metal part of the size can be formed by one-pass welding by TIG arc welding using the flux-cored wire.

  Furthermore, the weld metal part having the melt width w of w> T1 or the weld cross-sectional area A of A> B1 is at least applied to nuclear equipment, thermal equipment, or automobile equipment. It is good to be formed in the mold joint.

  In other words, in the T-type joint penetration welding method of the present invention, non-consumable electrode type arc welding is performed using a shield gas supply means for flowing out an inert gas shield gas, and at the same time, a penetration depth promoting flux agent is obtained. The flux-cored wire filled with is melted to the lower vertical plate while being fed to the arc welded portion, and at least the melt width w on the vertical plate side after passing through the back surface of the upper plate is larger than the plate thickness T1 of the upper plate. (W> T1) or by forming a welded cross-sectional area A of a penetration part on the back side of the upper plate or a melting width part on the vertical plate side larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1). Even if it is a T-shaped joint made of stainless steel or low carbon steel that has not been pre-processed, the upper plate and the lower vertical plate can be reliably melt-bonded to obtain a sound weld metal part of a predetermined shape. it can. In addition, even for members that require a certain level of weld strength, it is possible to secure a weld cross-sectional area larger than the plate thickness cross-sectional area on the upper plate side, and to obtain a tensile strength (weld strength) equal to or higher than the upper plate material strength. it can.

  In the penetration welding method of the present invention, non-consumable electrode type arc welding is performed using a double shield gas supply means for flowing out a shield gas containing an inert gas and a shield gas containing an oxidizing gas, and at the same Flux-cored wire filled with a depth promoting flux agent is melted to the lower standing plate while being fed to the arc welding part, and at least the melting width w on the standing plate side after passing through the upper plate back surface is increased above It is formed larger than the plate thickness T1 (w> T1), or the weld cross-sectional area A of the penetration portion on the back side of the upper plate or the melting width portion on the standing plate side is larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1 ) By forming, as described above, even if it is a T-shaped joint made of stainless steel material or low carbon steel material that has not been grooved, the upper plate and the lower standing plate can be reliably melt-bonded, Sound welded metal parts of a predetermined shape Can be obtained. In addition, even for members that require a certain level of weld strength, it is possible to secure a weld cross-sectional area larger than the plate thickness cross-sectional area on the upper plate side, and to obtain a tensile strength (weld strength) equal to or higher than the upper plate material strength. it can.

  In the penetration welding method of the present invention, a T-shaped joint is manufactured by placing one upper plate that is thinner than the thickness of the vertical plate on the upper surface of the lower vertical plate, or two in parallel. According to the process, the T-shaped joint to be welded can be manufactured in a predetermined shape. After that, non-consumable electrode type arc welding is performed using a shield gas supply means that flows out an inert gas shielding gas, and at the same time, a flux-cored wire filled with a flux agent that promotes penetration depth is arc-welded. Non-consumable electrode type arc welding using a double shield gas supply means that melts to the lower vertical plate while feeding to the part, or flows out the shield gas containing inert gas and shield gas containing oxidizing gas At the same time, the flux-cored wire is melted to the lower vertical plate while being fed to the arc welded portion, and at least the melt width w on the vertical plate side after passing through the upper plate back surface is determined from the plate thickness T1 of the upper plate. Large (w> T1) formation, or weld cross-sectional area A of the penetration part on the back side of the upper plate or the melting width part on the vertical plate side is larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1), or before In the second step of forming both the melt width w and the weld cross-sectional area A to the size of w> T1 and A> B1, a T-shaped joint made of stainless steel material or low carbon steel material not subjected to groove processing. Even in such a case, the upper plate and the lower standing plate can be reliably melt-bonded, and a sound weld metal part having a predetermined shape can be obtained. Further, as described above, even for a member that requires a certain level of welding strength, a tensile strength equal to or higher than the upper plate material strength is obtained by ensuring the melt width w and the weld cross-sectional area A (A> B1). be able to. In addition, it is not necessary to install a backing material, welding deformation is small, and there is no melting, so the number of work steps can be reduced.

  Further, in another through welding method of the present invention, when two upper plates in the thickness T1 range are butt-arranged in parallel on the upper surface of the thick wall, there is almost no gap G in the butt portion. Or, even if it is set to be within a small gap G range (0 ≦ G ≦ 0.2 × T1) of 0.2 times or less of the plate thickness T1 of the upper plate, preferably 0 ≦ G ≦ 0.1 times or less. By further suppressing the setting within the range of 0.1 × T1, the assembly accuracy and positioning accuracy are improved, and one of the factors that may adversely affect the welding quality can be removed. After that, a non-consumable electrode method is used by using a shield gas supply means for flowing out an inert gas shield gas or a double shield gas supply means for flowing out an inert gas shield gas and a shield gas containing an oxidizing gas. At the same time that arc welding is performed, a flux cored wire filled with a flux agent that promotes penetration depth is melted to the lower vertical plate while being fed to the arc welding portion, and at least the melting width w is set to w> T1. Or the weld cross section A is formed in a size of A> B1, or both the melt width w and the weld cross section A are formed in a size of w> T1 and A> B1. As described above, even if it is a T-shaped joint made of stainless steel material or low carbon steel material that has not been grooved, the upper plate and the lower vertical plate can be reliably melt-bonded, and a predetermined shape of soundness can be obtained. A weld metal part can be obtained. Moreover, even if the member requires a certain level of welding strength, the melt width w and the weld cross-sectional area A can be secured, and a tensile strength equal to or higher than the upper plate material strength can be obtained.

  According to still another through welding method of the present invention, a laser torch is arranged so that a focal position of a laser beam irradiated to a place to be welded is shifted to an upper side from the surface of the upper plate, and the laser for focal blurring is arranged. At the same time as performing laser welding by beam irradiation, the wire is fed to the laser welding portion and melted to the lower vertical plate, and at least the melt width w on the vertical plate side after passing through the upper plate back surface is set to the plate thickness T1 of the upper plate. Forming larger (w> T1), or forming the welding cross-sectional area A of the penetration portion on the back side of the upper plate or the melting width portion on the standing plate side larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1), or Even if it is a T-shaped joint made of a stainless steel material or a low carbon steel material that has not been subjected to groove processing, by forming both the melt width w and the weld cross-sectional area A so that w> T1 and A> B1. Make sure that the upper plate and the lower vertical plate are Can fusion bonding, it is possible to obtain a sound weld metal of a predetermined shape. Moreover, even if the member requires a certain level of welding strength, the melt width w and the weld cross-sectional area A can be secured, and a tensile strength equal to or higher than the upper plate material strength can be obtained. When the focal position of the laser beam is determined to be just hocus (distance L = 0), which is the upper plate surface, or when it is determined to be inside the T-shaped joint (distance L <0), it deeply melts in the depth direction. A deep penetration shape can be obtained by the keyhole type penetration form, but the penetration width in the welding width direction is conversely narrowed, so the penetration width w on the vertical plate side is larger than the thickness T1 of the upper plate (w> T1) ) Since it cannot be formed, it is not preferable.

  Further, the melt width w on the vertical plate side is formed larger than the plate thickness T1 of the upper plate (w> T1), and at the same time, the bead surface height C on the upper plate side is 1 to 3 mm higher than the upper plate surface (1 ≦ 1). C ≦ 3 mm) By forming and forming a convex shape, a sound weld metal part having a predetermined shape can be obtained, and a good convex weld bead having no dent or undercut on the weld surface of the T-shaped joint can be obtained. Can do. Even if the member requires a certain level of welding strength, it is possible to obtain a tensile strength equal to or higher than the strength of the upper plate material by ensuring the weld cross-sectional area A (A> B1).

  Further, the thickness T1 range of the upper plate is set to 2 <T1 ≦ 6 mm, and preferably set to the range of 2 <T1 ≦ 5 mm, so that the lower surface penetrates the back surface from the upper plate surface. It is possible to surely melt and join up to the vertical plate side, and to obtain a weld metal part having a sound penetration shape. Further, by setting the plate thickness T2 range of the upright plate to 2.5 times to 5 times (2.5 × T1 ≦ T2 ≦ 5 × T1) of the plate thickness T1 of the upper plate, Even if there is a slight misalignment between the welding line on the plate side and the upper surface of the lower standing plate, it is possible to obtain a weld metal portion having a sound penetration shape without melting and sagging at the end surface portion on the standing plate side. .

  If the plate thickness T1 of the upper plate is less than 2 mm, welding deformation due to excessive melting on the upper plate side tends to increase. On the contrary, if the thickness T1 of the upper plate is larger than 6 mm, it is difficult to melt from the upper plate surface to the lower surface through the lower plate side, and the melting width w on the vertical plate side is made sufficiently large. It is also difficult to form. In order to forcibly melt, a high-power arc welding apparatus is required, and welding deformation due to excessive melting of the upper plate tends to increase, which is not preferable. On the other hand, if the thickness T2 of the standing plate is less than 2.5 times the thickness T1 of the upper plate, for example, there is a displacement between the welding line on the upper plate side to be welded and the upper surface of the lower standing plate. In this case, it is easy for melting to occur at one end surface portion on the vertical plate side, or to form a distorted shape with uneven penetration. On the other hand, if the thickness T2 of the vertical plate is larger than 5 times the thickness T1 of the upper plate, the ratio of the melt width w and the welding cross-sectional area A on the vertical plate side to the vertical plate thickness T2 decreases. This is not preferable because the thickness balance with the thickness T1 of the upper plate is deteriorated and the weight of the material itself is increased.

  Further, if the bead surface height C on the upper plate side is smaller than 1 mm, an undercut is likely to occur at the bead boundary. On the other hand, if the bead surface height C is larger than 3 mm, the penetration depth becomes shallow, the bead appearance is deteriorated, and excessive protruding portions are not preferable.

  The non-consumable electrode type arc welding is, for example, TIG arc welding or plasma arc welding, and it is not necessary to newly introduce special welding equipment, and an existing welding machine can be used. In particular, welding is performed while feeding a flux-cored wire filled with a flux agent that promotes penetration depth during the arc welding (TIG arc welding or plasma arc welding). A molten pool directly under the arc by a heating reaction of multiple metal oxides contained (for example, a chemical reaction in which oxygen is dissociated from the molten metal oxide and most of the dissociated oxygen is dissolved in the molten pool). As a result of the convection of (molten metal) changing in the depth direction and inward direction to promote the penetration state, the penetration depth becomes deeper. The penetration shape and the melting depth can be adjusted by adjusting the feeding amount of the flux-cored wire, the content of the metal oxide, or the mixing ratio. Also, it can be adjusted according to the welding heat input conditions such as welding current and welding speed, and in advance to ensure a predetermined range of melt width w and welding cross-sectional area A according to the thickness and application of the joint member. It is recommended to perform a confirmation test.

The flux agent filled in the flux-cored wire is a plurality of metal oxides, for example, various powders composed of components such as TiO ₂ , SiO ₂ , Cr ₂ O ₃ . The penetration depth facilitating flux-cored wire is a special wire filled with a mixture of metal oxides of these component powders at an appropriate ratio, and is used to promote the penetration state due to the heating reaction that occurs during arc welding. , It has the action and effect of increasing the penetration depth. There is an action and an effect of increasing the penetration depth. Such a penetration depth facilitating flux cored wire is completely different from the conventional wire (flux cored wire) containing a deoxidizer and a basic iron making agent, and promotes the penetration depth. This is a special wire filled with the metal oxide powder, and a known commercial product may be used.

  Further, in the penetration welded structure of the present invention, non-consumable electrode type arc welding is performed using a shield gas supply means for flowing out an inert gas shield gas, and at the same time, a penetration depth promoting flux agent is filled. Using a double shield gas supply means that melts the flux-cored wire to the lower vertical plate while feeding the flux-cored wire to the arc welding part, or flows out the shielding gas containing inert gas and shielding gas containing oxidizing gas The non-consumable electrode type arc welding is performed at the same time, and the flux-cored wire is melted to the lower vertical plate while being fed to the arc welding portion, and at least the melting width w on the vertical plate side after passing through the upper plate back surface is set. It is formed larger than the plate thickness T1 of the upper plate (w> T1), or the weld cross section A of the penetration portion on the back surface of the upper plate or the melting width portion on the standing plate side is larger than the plate thickness cross sectional area B1 on the upper plate side ( > B1) Thickness on the upper plate side by forming or forming a structure with a weld metal part in which both the melting width w and the weld cross-sectional area A are formed in the size of w> T1 and A> B1 A weld metal part and weld structure having a welded shape having a weld cross-sectional area larger than the cross-sectional area can be obtained, and the weld cross-sectional area A can be secured even for a member that requires a certain level of weld strength (A> By B1), a tensile strength (welding strength) equal to or higher than the upper plate material strength can be obtained.

  Further, the melt width w on the vertical plate side is formed larger than the plate thickness T1 of the upper plate (w> T1), and at the same time, the bead surface height C on the upper plate side is 1 to 3 mm higher than the upper plate surface (1 ≦ 1). (C <= 3mm) It can also be set as the structure provided with the weld metal part formed and made convex shape. The weld metal part of the size is formed by one-pass welding by TIG arc welding using the flux-cored wire, or by one-pass welding by the laser welding using a laser beam with a blurred focus. Thus, as described above, it is possible to provide a weld metal and weld structure having a penetration shape having the melt width w and weld cross-sectional area A necessary to obtain a tensile strength equal to or higher than the upper plate material strength. Can do. The non-consumable electrode type arc welding using the flux-cored wire has a convection type (and heat conduction type) penetration shape and does not generate spatter (spatter of molten metal) at all. In addition, it is not necessary to install a backing material, a deep penetration of a predetermined shape can be reliably formed by one-pass welding, welding deformation is small, and there is no melt-down, so that the number of work steps and welding time can be reduced.

  Furthermore, the weld metal part having the melt width w of w> T1 or the weld cross-sectional area A of A> B1 is applied to at least nuclear equipment, thermal equipment, or automobile equipment. As a result, it is possible to reduce welding deformation, man-hours and costs as compared with the conventional welded structure.

  As described above, according to the penetration welding method and penetration welding structure of the T-shaped joint of the present invention, it is not necessary to form a groove or a joint gap on the upper plate side, and one-pass welding with deep penetration is possible. A sound weld metal part that is melted from the upper plate surface to the lower vertical plate side and securely joins the upper plate and the lower vertical plate, and a tensile strength equal to or higher than the upper plate material strength (weld strength) ) Can be obtained. Moreover, there is no need to install a backing material, and no melting occurs. As a result, it is possible to reduce welding deformation, man-hours and costs as compared with conventional welding methods and weldments.

  Hereinafter, the contents of the present invention will be described in detail with reference to the embodiments shown in FIGS.

  FIG. 1 is an explanatory view showing an embodiment of a welding procedure and a penetration shape related to the T-type joint penetration welding method of the present invention. That is, in the first first step 21, as shown in FIG. 1 (1), one upper plate 1 along the horizontal direction is placed on the upper surface of the lower standing plate 3 along the vertical direction, A T-shaped joint having a T-shape is produced by arranging two plates 1 and 2 in parallel. The T-type joint to be welded is, for example, a welded article incorporated in nuclear equipment, thermal equipment, automobile equipment, or the like. It is mainly made of stainless steel or low carbon steel, and the thickness T1 range of the upper plates 1 and 2 is 2 <T1 ≦ 6 mm. It is preferable to keep it in the range of 2 <T1 ≦ 5 mm. The T2 range of the lower standing plate 3 is 2.5 times or more and 5 times or less (2.5 × T1 ≦ T2 ≦ 5 × T1) of the thickness T1 of the upper plates 1 and 2, and the upper surface of the standing plate 3 In addition, the upper plates 1 and 2 of the thin wall T1 are arranged in a T-shape by overlapping one piece in the horizontal direction or arranging two pieces in parallel. There is almost no gap G in the butt portion on the upper plate 1 and 2 side, and there is almost no gap on the joint surface between the upper plate 1 and 2 and the lower standing plate 3 with relatively high accuracy. Positioned and arranged. In the figure, B1 indicates the thickness cross-sectional area in the thickness T1 direction on the upper plates 1 and 2 side.

  In the next second step 22, as shown in FIG. 1 (2), an inert gas (for example, pure Ar gas, He gas, or a mixed gas of Ar and He is used as the shielding gas 9b from the inner periphery of the nozzle 9a. A non-consumable electrode type arc welding is performed using an outflow shield welding torch (shield gas supply means), and at the same time, a flux-cored wire 4 filled with a flux depth promoting flux agent is connected to an arc 6 welding part. And melt-bonded from the surface side of the upper plates 1 and 2 to the side of the lower standing plate 3. At the same time, at least the melting of the standing plate 3 after passing through the back surface of the upper plates 1 and 2 is achieved by this melt-bonding. The width w is made larger than the plate thickness T1 of the upper plates 1 and 2 (w> T1), or the welding cross-sectional area A of the penetration width w portion on the back of the upper plates 1 and 2 or the standing plate 3 side is the upper plate 1. , Larger than the cross-sectional area B1 on the two sides (A> B1) Both the melt width w and the weld cross-sectional area A are formed so that w> T1 and A> B1.

  The weld cross-sectional area A of the melt width w is determined by the product of the melt width w on the upright plate 3 side and the weld line length L (A = w × L). Similarly, the plate thickness cross-sectional area B1 in the plate thickness T1 direction is obtained by the product (B1 = T1 × L) of the plate thickness T1 of the upper plates 1 and 2 and the weld line length L, and the melting width w is calculated as follows. If it is formed so that w> T1, the weld cross-sectional area A at that time is formed larger than the plate thickness cross-sectional area B1 (A> B1).

  The non-consumable electrode type arc welding is, for example, TIG arc welding or plasma arc welding, and it is not necessary to newly introduce special welding equipment, and an existing welding machine can be used. In particular, by performing non-consumable electrode type arc welding (TIG arc welding or plasma arc welding) using a flux cored wire 4 filled with a flux agent promoting penetration depth, the flux cored wire 4 The arc 6 is heated by a reaction of a plurality of metal oxides contained therein (for example, a chemical reaction in which oxygen is dissociated from the molten metal oxide and most of the dissociated oxygen is dissolved in the molten pool 7a). As a result of the convection of the molten pool 7a (molten metal) immediately below changing in the depth direction and inward direction to promote the penetration state, the penetration depth becomes deeper. The penetration shape and the melting depth can be adjusted by adjusting the feeding amount of the flux-cored wire 4, the content of the metal oxide, or the mixing ratio. Also, it can be adjusted according to the welding heat input conditions such as welding current and welding speed, and in advance to ensure a predetermined range of melt width w and welding cross-sectional area A according to the thickness and application of the joint member. It is recommended to perform a confirmation test.

The flux agent filled in the flux-cored wire 4 is a plurality of metal oxides, for example, various powders made of components such as TiO ₂ , SiO ₂ , Cr ₂ O ₃ . A penetration depth promoting flux-cored wire 4 is a special wire in which a plurality of metal oxides of these component powders are mixed and filled at an appropriate ratio, and promotes the penetration state by the heating reaction generated during arc welding. Therefore, it has the action and effect of increasing the penetration depth. Such a penetration depth promoting flux-cored wire 4 is completely different in composition and action from a conventional wire (flux-cored wire) containing a general deoxidizing agent or a basic iron making agent. It is a special wire filled with a metal oxide powder (for example, a component powder of TiO ₂ , SiO ₂ , Cr ₂ O _3, etc.) that promotes the heat treatment, and a known commercial product may be used.

The non-consumable electrode 5 is a tungsten electrode provided at the tip of the welding torch 8, and is commercially available such as W containing La ₂ O _3, W containing Y ₂ O _3, W containing ThO _2, etc. Product electrode rods may be used. The shield gas 9b that protects the welded portion of the arc 6 and the electrode 5 is an inert gas that flows out from the inner periphery of the nozzle 9a, for example, pure Ar gas or He gas, and an Ar-based mixed gas is also used. It is possible to use a commercially available gas.

  As shown in FIGS. 1 (2) and (3), at least the melting width w on the upright plate 3 side after passing through the back surfaces of the upper plates 1 and 2 is larger than the thickness T1 on the upper plate 1 and 2 sides (w> T1). ) Formation or formation of the weld cross-sectional area A of the penetration portion on the back side of the upper plate or the melting width portion on the standing plate side larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1), or the melting width w and the welding By forming both cross-sectional areas A in the size of w> T 1 and A> B 1, the top plate 1, 2, even if it is a T-shaped joint made of stainless steel or low carbon steel that has not been grooved And the lower standing plate 3 can be reliably melt-bonded, and a predetermined welded metal portion 7b can be obtained. In addition, even for members that require a certain level of weld strength, a weld cross-sectional area A larger than the plate thickness cross-sectional area B1 on the upper plate side can be secured (A> B1), and a tensile strength equal to or higher than the upper plate material strength ( Welding strength) and weld deformation can be reduced at the same time.

  The flux-cored wire 4 that promotes penetration depth can be fed from the front in the welding progress direction to the arc 6 welding portion, or can be fed from the rear in the welding progress direction to the arc 6 welding portion. In particular, by feeding the flux-cored wire 4 that promotes the penetration depth to the arc 6 welding portion from the rear in the welding direction, for example, a wide range of welding current (eg, 100 to 350 A) from a small current to a large current can be obtained. Even in the case of outputting, the flux-cored wire 4 smoothly enters the melt pool 7a directly under the arc 6 and can be melted and welded stably without forming large droplets. At the same time, it can be deeply melted from the surface of the upper plates 1 and 2 to the lower vertical plate 3 side, and the melt width w can be formed larger than the plate thickness T1 on the upper plates 1 and 2 side (w> T1). The weld metal part 7b can be obtained.

  Further, by performing non-consumable electrode type arc welding using the flux-cored wire 4 of the backward feeding method, the melting width w on the upright plate 3 side is made larger than the plate thickness T1 of the upper plates 1 and 2 (w > T1) At the same time as forming, the bead surface height C on the upper plate 1, 2 side is 1 to 3 mm higher than the upper plate surface (1 ≦ C ≦ 3 mm) to form a convex shape. The weld metal portion 7b can be obtained, and a good weld bead having a convex shape without a dent or undercut on the weld surface of the T-shaped joint can be obtained. Even if the member requires a certain level of welding strength, it is possible to obtain a tensile strength equal to or higher than the strength of the upper plate material by ensuring the weld cross-sectional area A (A> B1).

  As described above, by setting the thickness T1 range of the upper plates 1 and 2 to 2 <T1 ≦ 6 mm, preferably by setting the range to 2 <T1 ≦ 5 mm, The weld metal portion 7b having a sound penetration shape can be obtained by reliably melting and joining from the front surface to the back surface through the lower vertical plate 3 side. Further, by setting the plate thickness T2 range of the standing plate 3 to 2.5 times or more and 5 times or less (2.5 × T1 ≦ T2 ≦ 5 × T1) of the plate thickness T1 of the upper plates 1 and 2, welding is performed. Even if there is a slight misalignment between the upper and lower welding lines of the upper plate 1 and 2 and the upper surface of the lower vertical plate, the weld metal has a sound penetration shape that does not melt at the end surface portion of the vertical plate 3 Part 7b can be obtained.

  If the thickness T1 of the upper plates 1 and 2 is less than 2 mm, welding deformation due to excessive melting of the upper plates 1 and 2 tends to increase. On the contrary, if the plate thickness T1 of the upper plates 1 and 2 is larger than 6 mm, it is difficult to melt from the upper plate surface to the lower surface through the back surface and to the lower vertical plate 3 side. It is also difficult to form a sufficient size. In order to forcibly melt and join, a high-power arc welding device is required, and welding deformation due to excessive melting of the upper plates 1 and 2 tends to increase, which is not preferable. On the other hand, if the plate thickness T2 of the standing plate 3 is less than 2.5 times the plate thickness T1 of the upper plates 1 and 2, for example, the welding line on the upper plate 1 or 2 side to be welded and the upper surface of the standing plate 3 When there is a positional shift, the one end surface portion on the upright plate 3 side is likely to melt and sag, or the penetration is likely to be uneven or distorted. On the contrary, if the thickness T2 of the upright plate 3 is thicker than five times the thickness T1 of the upper plates 1 and 2, the melt width w on the upright plate 3 side and the welding cross-sectional area A with respect to the thickness T2 of the upright plate 3 This is not preferable because the ratio decreases, the balance between the thicknesses T1 and T1 of the upper plates 1 and 2 deteriorates, and the weight of the material itself increases.

  Further, if the bead surface height C on the upper plate side is smaller than 1 mm, an undercut is likely to occur at the bead boundary. On the other hand, if the bead surface height C is larger than 3 mm, the penetration depth becomes shallow, the bead appearance is deteriorated, and excessive protruding portions are not preferable.

  In the penetration welding structure of the present invention, non-consumable electrode type arc welding is performed using a shield structure welding torch (shield gas supply means) that flows out the inert gas shield gas 9b, and at the same time, penetration depth acceleration The flux-cored wire 4 filled with the fluxing agent is melted to the lower standing plate 3 while being fed to the arc 6 welding portion, and at least the melt width w on the standing plate 3 side after passing through the upper plate 1, 2 back surface Is larger than the plate thickness T1 of the upper plate (w> T1), or the weld cross-sectional area A of the penetration portion on the back surface of the upper plate or the melting width portion on the standing plate side is larger than the plate thickness cross-sectional area B1 on the upper plate side (A > B1) Formation or a structure including a weld metal portion 7b in which both the melting width w and the weld cross-sectional area A are formed in the size of w> T1 and A> B1 can be adopted.

  As a result, a sound weld metal part 7b and a welded structure having a welded cross-sectional area A larger than the plate thickness cross-sectional area B1 on the upper plate 1, 2 side are obtained, and a member that requires a certain degree of welding strength is obtained. Even so, by ensuring the weld cross-sectional area A (A> B1), it is possible to obtain a tensile strength (welding strength) equal to or higher than the strength of the upper plate material, and at the same time, it is possible to reduce welding deformation.

  Further, the melt width w on the upright plate 3 side is formed larger than the plate thickness T1 of the upper plates 1 and 2 (w> T1), and at the same time, the bead surface height C on the upper plate 1 and 2 side is set from the upper plate surface. A structure having a weld metal portion 7b formed to be 1 to 3 mm higher (1 ≦ C ≦ 3 mm) to have a convex shape may be employed. Further, the weld metal portion 7b having the size may be formed by one-pass welding by TIG arc welding using the flux-cored wire 4.

  Thereby, a sound weld metal part 7b having a penetration shape and a welded structure having the melt width w and weld cross-sectional area A necessary for obtaining a tensile strength equal to or higher than the upper plate material strength can be obtained. In addition, arc welding of the non-consumable electrode method using the flux-cored wire that promotes penetration depth is a convection type (and heat conduction type) penetration shape, and a deep penetration of a predetermined shape is ensured by one-pass welding. It can be formed and there is no spatter (spatter of molten metal). In addition, it is not necessary to install a backing material, only one pass of welding man-hour using the flux-cored wire 4 is required, welding deformation is small, and there is no melting, so man-hours and welding time can be reduced.

  In particular, a welded structure of a T-type joint incorporated in nuclear equipment, thermal equipment, or automobile equipment has the melt width w of w> T1 or the weld cross-sectional area A of A> B1. By applying the weld metal part, it is possible to reduce welding deformation, man-hours and costs as compared with the conventional welded structure part.

  FIG. 2 is an explanatory view showing another embodiment of the welding procedure and penetration shape related to the T-type joint penetration welding method of the present invention. The main difference from FIG. 1 is that when two upper plates 1 and 2 are butt-arranged in parallel on the upper surface of the lower standing plate 3, there is no gap G at the butt portion between the upper plates 1 and 2. The other parts and symbols are the same as in FIG.

  It is unexpectedly difficult to assemble a T-shaped joint with a long weld line without gap G, and it is likely that there is no gap G at the butt portion between upper plates 1 and 2. There may be a slight gap on the joint surface between the plates 1 and 2 and the upper surface of the lower upper plate 3. In particular, when the gap G is excessively large as a whole, or when the gap G changes greatly, which sometimes exceeds the allowable value, the welding quality is adversely affected (for example, uneven penetration, uneven bead shape, Cut). In order to avoid this, in this embodiment, the allowable gap G range is limited.

  That is, in the first first step 21, as shown in FIG. 2 (1), when the two upper plates 1, 1 are butt-arranged in parallel on the upper surface of the upright plate 3, the gap G is almost at the butt portion. Even if there is no state, the gap G is set within a small gap G range (0 ≦ G ≦ 0.2 × T1) which is 0.2 times or less of the plate thickness T1 on the upper plate side. Preferably, it is set to be further suppressed within the range of 0 ≦ G ≦ 0.1 × T1 of 0.1 times or less. Moreover, it is good to suppress to 0.5 mm or less in the state where there is almost no gap between the upper plates 1 and 2 and the upper surface of the lower upper plate 3. In this way, by suppressing the gap G range, assembly accuracy and positioning accuracy are increased, and one of the factors that may adversely affect welding quality can be removed.

  As described above, the T-shaped joint to be welded is a welded article incorporated in nuclear equipment, thermal equipment, automobile equipment, or the like. Mainly made of stainless steel or low carbon steel, the thickness T1 range of the upper plates 1 and 2 is 2 <T1 ≦ 6 mm, and the T2 range of the lower vertical plate 3 is that of the upper plates 1 and 2 The plate thickness T1 is 2.5 times or more and 5 times or less (2.5 × T1 ≦ T2 ≦ 5 × T1). The upper plates 1 and 2 of the thin wall T1 are arranged on the upper surface of the upright plate 3 so as to overlap each other in the horizontal direction or in parallel with each other in a T-shape.

  In the next second step 22, as shown in FIG. 2 (2), the T-type joint with or without the small gap G is not used by using shield gas supply means for flowing out the inert gas shield gas 9 b. At the same time as performing consumable electrode type arc welding, a flux-cored wire 4 filled with a flux agent that promotes penetration depth is fed to the arc 6 welding portion, and the lower side from the surface side of the upper plates 1 and 2 Are melt-bonded to the vertical plate 3 side. At the same time, at least the melt width w on the upright plate 3 side after passing through the back surfaces of the upper plates 1 and 2 is made larger than the thickness T1 (w> T1) of the upper plates 1 and 2 by this fusion bonding, or the upper plates 1 and 2 Forming the welding cross-sectional area A of the penetration portion on the back surface or the melting width w portion on the standing plate 3 side larger than the plate thickness cross-sectional area B1 on the upper plate 1 and 2 side (A> B1), or the melting width w and the welding break Both areas A are formed to have a size of w> T1 and A> B1. Furthermore, the bead surface height C on the upper plate side can be formed 1 to 3 mm higher than the upper plate surface (1 ≦ C ≦ 3 mm) to form a convex shape.

  Thereby, even if it is a T-shaped joint with or without the gap G, the upper plates 1 and 2 and the lower upright plate 3 can be reliably melt-bonded, and a sound weld metal portion 7b having a predetermined shape can be obtained. A good weld bead having a convex shape without a dent or undercut on the weld surface of the T-shaped joint can be obtained. Even if the member requires a certain level of weld strength, a tensile strength equal to or higher than the upper plate material strength can be obtained by ensuring the melt width w and the weld cross-sectional area A (A> B1).

  In particular, when arc welding of the T-shaped joint with or without the gap G is performed, it is most preferable to finish in a predetermined shape by only one pass welding. However, for example, when a slight surplus or undercut occurs on the surface of the weld bead due to an insufficient amount of wire welding, the second pass welding may be performed. Note that the melting width w and the welding cross-sectional area A on the upright plate 3 side are already secured at predetermined sizes (w> T1, A> B1) by the first pass welding. For this reason, in the second pass welding, the welding conditions of the first pass are reviewed so that the surface of the weld beads on the upper plate 1 and 2 side is within a predetermined range (1 ≦ C ≦ 3 mm). By setting the welding conditions for the spot welding and performing the arc welding of the four-core flux-cored wire feed again from the bead surface of the previous layer welding, the above-mentioned lack of underfill and undercut are eliminated, and a healthy surplus height is achieved. It can improve to the weld metal part 7b which has the following welding bead and penetration shape. Moreover, it is also possible to perform arc welding of the second pass by using an ordinary solid wire or strand wire instead of the flux-cored wire, and it is possible to eliminate the excess filling and undercut.

  Further, in the through-welded structure of the present invention, as shown in FIGS. 2 (2) and (3), a welding torch 8 (shield gas supply means) having a shield structure that flows out a shield gas 9b of an inert gas is used. At the same time, the non-consumable electrode type arc welding is performed, and at the same time, the flux cored wire 4 filled with the flux agent that promotes the penetration depth is melted to the lower vertical plate 3 while being fed to the arc 6 welding portion. At least the melting width w on the standing plate 3 side after penetrating the upper plates 1 and 2 is formed to be larger than the plate thickness T1 of the upper plates 1 and 2 (w> T1), or the penetrating portion or standing plate of the upper plates 1 and 2 Form the weld cross-sectional area A of the melt width w portion on the 3 side larger than the plate thickness cross-section area B1 on the upper plate 1, 2 side (A> B1), or both the melt width w and the weld cross-sectional area A> Structure with weld metal portion 7b formed to have a size of T1 and A> B1 Able to.

  As a result, a sound weld metal part 7b and a welded structure can be obtained, and even if the member requires a certain level of weld strength, the upper plate can be secured by securing the weld cross section A (A> B1). A tensile strength (welding strength) equal to or higher than the material strength can be obtained, and at the same time, welding deformation can be reduced.

  In particular, a welded structure of a T-type joint incorporated in nuclear equipment, thermal equipment, or automobile equipment has the melt width w of w> T1 or the weld cross-sectional area A of A> B1. By applying the weld metal part, it is possible to reduce welding deformation, man-hours and costs as compared with the conventional welded structure part.

  Next, FIG. 3 is explanatory drawing which shows further embodiment of the welding procedure and penetration shape regarding the penetration welding method of the T-shaped joint of this invention. The main difference from FIG. 1 is that a non-consumable electrode is formed by using a welding torch 8b (double shield gas supply means) having a double shield structure that flows out a shield gas containing an inert gas and a shield gas containing an oxidizing gas. This is to carry out arc welding of the method. The shape of the T-shaped joint and the penetration shape of the welded portion are substantially the same as in FIG.

That is, as shown in FIG. 3 (2), a welding torch 8b having a double shield structure in which an inner pipe and an outer pipe are coaxially arranged is used, and an oxidizing gas (from the nozzle hole of the outer nozzle 10a) O ₂ or CO ₂ ) and an inert gas (Ar or He) mixed gas 10b is caused to flow out, and at the same time, an inert gas 9b (Ar or He) shielding gas is caused to flow out from the nozzle hole of the inner nozzle 9a. In addition, while performing arc welding of the non-consumable electrode system, while feeding the flux-cored wire 4 filled with the flux agent promoting penetration depth to the arc 6 welding portion, from the surface side of the upper plates 1 and 2 It melt-bonds to the lower standing plate 3 side. At the same time, at least the melt width w on the upright plate 3 side after passing through the back surfaces of the upper plates 1 and 2 is made larger than the thickness T1 (w> T1) of the upper plates 1 and 2 by this fusion bonding, Forming the welding cross-sectional area A of the penetration portion on the back surface or the melting width w portion on the standing plate 3 side larger than the plate thickness cross-sectional area B1 on the upper plate 1 and 2 side (A> B1), or the melting width w and the welding break Both areas A are formed to have a size of w> T1 and A> B1.

For example, a mixed gas 9b of several percent oxidizing gas (O ₂ or CO ₂ ) and inert gas (Ar or He) is allowed to flow from the nozzle hole of the outer nozzle 10a to the molten pool 7a portion immediately below the arc 6 and melt. When the arc welding is performed while feeding the facilitating flux-cored wire 4 to the arc 6 welding portion, oxygen dissociated from the oxidizing gas (O ₂ or CO ₂ ), and further, the flux-cored wire being melted Both oxygen dissociated from 4 (for example, a wire containing a fluxing agent made of a metal oxide such as TiO ₂ , SiO ₂ , Cr ₂ O ₃ ) are dissolved in the molten pool 7 a in large quantities. By this oxygen dissolution, the convection of the molten pool 7a immediately below the arc 6 changes greatly in the depth direction and the penetration further deepens, and at the same time it can be surely melt-bonded from the surface of the upper plate 1 to the lower vertical plate 3 side. The melting width w on the upright plate 3 side after passing through the upper plates 1 and 2 can be formed larger than the plate thickness T1 of the upper plates 1 and 2 (w> T1), The weld cross-sectional area A of the melt width w portion on the plate 3 side can be formed larger than the plate thickness cross-sectional area B1 on the upper plate 1 and 2 side (A> B1).

  It is to be noted that the adjustment of the penetration shape and the melting depth can be adjusted by adjusting the feeding amount of the flux-cored wire 4, the content of the metal oxide, or the mixing ratio, the content of the oxidizing gas, Adjustment is also possible by adjusting the gas flow rate. Furthermore, it can be adjusted according to the size of welding heat input conditions such as welding current and welding speed, and in order to ensure a predetermined range of melting width w and welding cross-sectional area A according to the thickness and application of the joint member. It is recommended to perform a confirmation test. Moreover, what is necessary is just to use a well-known commercial item for the mixed gas 10b of the said oxidizing gas and inert gas. Further, a welding shield torch 8b having a double shield structure may be used as a method for causing the shielding gas 9b of inert gas and the shielding gas 10b containing the oxidizing gas (the mixed gas 10b) to flow out.

  As described above, the weld cross-sectional area A of the melt width w portion is obtained by the product (A = w × L) of the melt width w on the vertical plate 3 side and the weld line length L. Similarly, the plate thickness cross-sectional area B1 in the plate thickness T1 direction is obtained by the product (B1 = T1 × L) of the plate thickness T1 of the upper plates 1 and 2 and the weld line length L, and the melting width w is calculated as follows. If it is formed so that w> T1, the weld cross-sectional area A at that time is formed larger than the plate thickness cross-sectional area B1 (A> B1).

  The non-consumable electrode type arc welding using the double shield structure welding torch 8b and the flux-cored wire 4 is a convection type (and heat conduction type) penetration shape, and a deep penetration of a predetermined shape by one-pass welding. Can be reliably formed, and no spatter is generated. In addition, it is not necessary to perform groove processing on the upper plate 1 side, installation of a backing material is unnecessary, and melting does not occur. Compared to conventional TIG welding, it is possible to reduce welding deformation, man-hours, and costs.

  In the first first step 21, as shown in FIG. 3 (1), one upper plate 1 along the horizontal direction is placed on the upper surface of the lower standing plate 3 along the vertical direction, or the upper plate A T-shaped joint with a T-shaped configuration is produced by butt-arranging 1 and 2 in parallel. As described above, the T-shaped joint to be welded is, for example, a welded product incorporated in nuclear equipment, thermal equipment, automobile equipment, or the like. It is mainly made of stainless steel or low carbon steel, and the thickness T1 range of the upper plates 1 and 2 is 2 <T1 ≦ 6 mm. It is preferable to keep it in the range of 2 <T1 ≦ 5 mm. Further, as described above, the T2 range of the lower standing plate 3 is 2.5 times to 5 times the thickness T1 of the upper plates 1 and 2 (2.5 × T1 ≦ T2 ≦ 5 × T1). The upper plates 1 and 2 of the thin wall T1 are disposed on the upper surface of the standing plate 3 so as to overlap each other in the horizontal direction or in parallel with each other in a T-shape.

  In the first step 21, when two upper plates in the range of the plate thickness T1 are butt-arranged in parallel on the upper surface of the thick wall, the gap G is set so that there is almost no gap G. Or, as shown in FIG. 2 (1), even if there is a gap G, the gap G is within a small gap G range (0 ≦ G ≦ 0.2 × T1) which is 0.2 times or less the plate thickness T1 of the upper plate. It is good to set it down.

  In the next second step 22, as shown in FIG. 3 (2), a welding torch 8 b having a double shield structure for flowing out a shielding gas 9 b of an inert gas and a shielding gas 10 b containing an oxidizing gas (double The non-consumable electrode type arc welding is performed using the shield gas supply means) and at the same time, the flux-cored wire 4 that promotes the penetration depth is melted to the lower vertical plate 3 while being fed to the arc 6 welding portion. , Forming at least the melting width w on the upright plate 3 side after penetrating the upper plates 1 and 2 larger than the plate thickness T1 of the upper plates 1 and 2 (w> T1), The welding cross-sectional area A of the melting width portion on the upright plate 3 side is formed larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1), or both the melting width w and the welding cross-sectional area A are set to w> T1 and A> B1 is formed.

  As a result, as described above, the upper plates 1 and 2 and the lower upright plate 3 can be reliably melt-bonded even with a T-shaped joint made of stainless steel material or low carbon steel material that has not been grooved. The sound weld metal part 7b having a predetermined shape can be obtained. In addition, even for members that require a certain level of weld strength, a weld cross-sectional area A larger than the plate thickness cross-sectional area B1 on the upper plate side can be secured (A> B1), and a tensile strength equal to or higher than the upper plate material strength ( Welding strength).

  The flux-cored wire 4 that promotes penetration depth can be fed from the front in the welding progress direction to the arc 6 welding portion, or can be fed from the rear in the welding progress direction to the arc 6 welding portion. In particular, by feeding the flux-cored wire 4 that promotes the penetration depth to the arc 6 welding portion from the rear in the welding direction, for example, a wide range of welding current (eg, 100 to 350 A) from a small current to a large current can be obtained. Even in the case of outputting, the flux-cored wire 4 smoothly enters the melt pool 7a directly under the arc 6 and can be melted and welded stably without forming large droplets. At the same time, it can be deeply melted from the surface of the upper plates 1 and 2 to the lower vertical plate 3 side, and the melt width w can be formed larger than the plate thickness T1 on the upper plates 1 and 2 side (w> T1). The weld metal part 7b can be obtained.

  Further, by performing non-consumable electrode type arc welding using the double shielded welding torch 8b and the backward feeding type flux-cored wire 4, the melting width w on the vertical plate 3 side is set to the upper plate 1 side. , 2 is formed larger than the plate thickness T1 (w> T1), and at the same time, the bead surface height C on the upper plate 1, 2 side is 1 to 3 mm higher than the upper plate surface (1 ≦ C ≦ 3 mm) to form a convex shape By doing so, as described above, a sound weld metal portion 7b having a predetermined shape can be obtained, and a good weld bead having a convex shape with no dents or undercuts on the weld surface of the T-shaped joint can be obtained. Even if the member requires a certain level of welding strength, it is possible to obtain a tensile strength equal to or higher than the strength of the upper plate material by ensuring the weld cross-sectional area A (A> B1). If the bead surface height C on the upper plate side is smaller than 1 mm, an undercut is likely to occur at the bead boundary. On the other hand, if the bead surface height C is larger than 3 mm, the penetration depth becomes shallow, the bead appearance is deteriorated, and excessive protruding portions are not preferable.

  In addition, in the through-welded structure of the present invention, as shown in FIGS. 3 (2) and (3), a double shield structure in which an inert gas shield gas 9b and an oxidizing gas shield gas 10b flow out. A non-consumable electrode type arc welding is performed using a welding torch 8b (double shield gas supply means), and at the same time, a flux-cored wire 4 filled with a flux agent promoting penetration depth is sent to the arc 6 welding portion. Melting to the lower standing plate 3 while feeding, forming at least the melting width w on the standing plate 3 side after passing through the back surfaces of the upper plates 1 and 2 larger than the plate thickness T1 of the upper plates 1 and 2 (w> T1), Alternatively, the weld cross-sectional area A of the penetration portion of the back surface of the upper plates 1 and 2 or the melting width w portion of the upright plate 3 side is larger than the plate thickness cross-sectional area B1 of the upper plates 1 and 2 (A> B1), or the melting Both width w and the weld cross-sectional area A are expressed as w> T1 and A> B1. Possible to having a weld metal portion 7b which is formed in a size structures may be.

  As a result, as described above, a weld metal part 7b and a welded structure having a penetration shape can be obtained, and even if the member requires a certain level of weld strength, the weld cross-sectional area A is ensured (A> By B1), it is possible to obtain a tensile strength (welding strength) equal to or higher than the strength of the upper plate material, and at the same time to reduce welding deformation. In particular, a welded structure of a T-type joint incorporated in nuclear equipment, thermal equipment, or automobile equipment has the melt width w of w> T1 or the weld cross-sectional area A of A> B1. By applying the weld metal part, it is possible to reduce welding deformation, man-hours and costs as compared with the conventional welded structure part.

  FIG. 4 is an explanatory view showing an embodiment of a laser welding procedure and a penetration shape related to the T-type joint penetration welding method of the present invention. The main difference from FIG. 1 and FIG. 3 is that instead of arc welding, laser welding is performed using a laser torch to defocus laser beam irradiation, and at the same time the wire is fed to the laser welding portion while It was made to melt even to the standing plate. Other parts and symbols are substantially the same as those in FIGS.

  That is, as shown in (2) of FIG. 4, in laser welding for defocusing (second step 24), a position (distance L) where the focal position 19 of the laser beam 18 is shifted upward from the surfaces of the upper plates 1 and 2. The laser torch 17 is disposed so that the laser beam 18 is irradiated with the laser beam 18 for defocusing, and at the same time, the wire 44 is melted to the lower standing plate 3 while being fed to the laser welding portion. Form the melt width w on the upright plate 3 side after penetration of the plates 1 and 2 larger than the plate thickness T1 of the upper plate (w> T1), or weld the penetration portion on the back side of the upper plate or the melt width portion on the upright plate 3 side The cross-sectional area A is formed larger than the plate thickness cross-sectional area B1 on the upper plate 1, 2 side (A> B1), or both the melt width w and the weld cross-sectional area A are set to w> T1 and A> B1. Try to form.

As the laser beam 18, any one of a CO ₂ laser, a YAG laser, a fiber laser, or a disk laser may be used. In particular, the focal position 19 of the laser beam 18 to be used is at least a position L shifted upward from the surfaces of the upper plates 1 and 2 (for example, a distance L> T1 larger than the plate thickness T1 on the upper plate 1 side). A laser torch 17 (for example, a laser processing torch composed of a condensing lens or the like for condensing the laser beam and irradiating the workpiece) so as to be positioned, and the focus-blurred laser beam 18 should be welded It is important to irradiate the spot. By irradiation with such a laser beam with a defocusing blur, the bead width of the weld surface portion and the melt width w of the penetration portion are widened, and the melt width w on the standing plate 3 side is larger than the thickness T1 of the upper plates 1 and 2 ( w> T1) can be formed. Note that when the focal position 19 of the laser beam 18 is determined to be just hocus (L = 0), which is the upper plate surface, or when it is determined on the inner side of the T-shaped joint (L <0), a key that deeply melts in the depth direction. A deep penetration shape is obtained by the hole-type penetration form, but the penetration width in the welding width direction is conversely narrowed. As a result, the penetration width w on the vertical plate 3 side is larger than the thickness T1 of the upper plate (w > T1) Since it cannot be formed, it is not preferable.

  Therefore, in order to form the melt width w on the upright plate 3 side larger than the plate thickness T1 of the upper plates 1 and 2 (w> T1), the focal position 19 of the laser beam 18 is located above the surface of the upper plates 1 and 2. It is necessary to use a laser beam that is deviated (for example, the focus blur distance L is L> T1), the focus of the laser beam is blurred, the beam diameter is increased, and the energy density is decreased. By performing laser welding by such laser beam irradiation with defocusing, it is possible to change from a keyhole-type penetration form that deeply melts in the depth direction to a penetration form that spreads in the width direction. As a result, the melt width w on the upright plate 3 side can be formed larger than the plate thickness T1 of the upper plates 1 and 2 (w> T1), and at the same time, the weld cross-sectional area A of the melt width w portion can be set to It can be formed larger than the cross-sectional area B1 (A> B1).

  The wire 44 to be fed to the laser welded portion may be a solid wire or a strand wire that is the same quality as the T-shaped joint member. It is also possible to use the flux-cored wire 4 that promotes melting. Ar gas or N2 gas may be used for the shield gas 9c flowing through the laser welding portion. In this way, by feeding and welding the wire 44 to the laser welding portion in the atmosphere of the shield gas 9c, a sound weld metal portion 77b having a predetermined shape is obtained, and a dent and A good weld bead having a convex shape without a cut can be obtained.

  As described above, laser welding is performed by irradiating the laser beam 18 with defocusing, and at the same time, the wire 44 is melted to the lower standing plate 3 while being fed to the laser welding portion, and at least the upper plate 1, 2 back surface The penetration width w on the standing plate 3 side after penetration is made larger than the plate thickness T1 (w> T1), or the welding cross-sectional area A of the penetration portion on the back side of the upper plate or the melting width portion on the standing plate 3 side By forming larger than the plate thickness cross-sectional area B1 on the side of the plates 1 and 2 (A> B1), or by forming both the melt width w and the weld cross-sectional area A so that w> T1 and A> B1. Even with a T-shaped joint made of stainless steel or low carbon steel that has not been grooved, the upper plates 1 and 2 and the lower vertical plate 3 can be reliably melt-bonded, and a weld metal with a good penetration shape. A portion 77b and a welded structure can be obtained. Moreover, even if the member requires a certain level of welding strength, it is possible to obtain a tensile strength (welding strength) equal to or higher than the upper plate material strength by securing the welding cross-sectional area A (A> B1), and welding at the same time. The deformation can also be reduced.

  As shown in (1) of FIG. 4, the T-shaped joint to be welded is a welded article incorporated in nuclear equipment, thermal equipment, automobile equipment, or the like. It is mainly made of stainless steel or low carbon steel, and the thickness T1 range of the upper plates 1 and 2 is 2 <T1 ≦ 6 mm, preferably 2 <T1 ≦ 5 mm. The T2 range of the lower standing plate 3 is 2.5 times or more and 5 times or less (2.5 × T1 ≦ T2 ≦ 5 × T1) of the plate thickness T1 of the upper plates 1 and 2. The upper plates 1 and 2 of the thin wall T1 are arranged on the upper surface of the upright plate 3 so as to overlap each other in the horizontal direction or in parallel with each other in a T-shape.

  In the through-welded structure of the present invention, as shown in FIGS. 4 (2) and 4 (3), the focal position 19 of the laser beam 18 irradiated to the place to be welded is shifted upward from the surfaces of the upper plates 1 and 2. The laser torch 17 is arranged so as to be in the position (distance L> T1), and laser welding is performed by irradiating the laser beam for defocusing. At the same time, the lower standing plate 3 is fed while feeding the wire 44 to the laser welding portion. And the melt width w on the standing plate 3 side after penetrating the upper plate back surface is made larger than the plate thickness T1 of the upper plates 1 and 2 (w> T1), or the through portion of the upper plate rear surface or the standing plate 3 side The weld cross-sectional area A of the melt width portion is formed larger than the plate thickness cross-section area B1 on the upper plate 1, 2 side (A> B1), or both the melt width w and the weld cross-sectional area A are set to w> T1 and A > A structure having a weld metal portion 77b formed to have a size of B1. Can be.

  As a result, as described above, it is possible to obtain a penetration-like sound weld metal portion 77b and a welded structure having a weld cross-sectional area A larger than the plate thickness cross-sectional area B1 on the upper plate 1 and 2 side. Even if it is a member that requires strength, it is possible to obtain a tensile strength (welding strength) equal to or higher than the upper plate material strength by ensuring the weld cross-sectional area A (A> B1), and at the same time reduce welding deformation. You can also.

  Further, the melt width w on the upright plate 3 side is formed larger than the plate thickness T1 of the upper plates 1 and 2 (w> T1), and at the same time, the bead surface height C on the upper plate 1 and 2 side is set from the upper plate surface. A structure including a weld metal portion 77b that is formed 1 to 3 mm higher (1 ≦ C ≦ 3 mm) to have a convex shape can also be used. In addition, the one-pass welding by the laser beam for blurring the focus can obtain a sound weld metal part 77b and a welded structure having the size, and at the same time, the work man-hours can be reduced.

  In particular, a welded structure of a T-type joint incorporated in nuclear equipment, thermal equipment, or automobile equipment has the melt width w of w> T1 or the weld cross-sectional area A of A> B1. By applying the weld metal part 77b, it is possible to reduce welding deformation, man-hours, and cost as compared with the conventional welded structure part.

  FIG. 5 is a cross-sectional view of a comparative example showing a multi-pass welding shape of a grooved T-shaped joint by a conventional TIG welding method. Moreover, FIG. 6 is sectional drawing of the other comparative example which shows the multipass welding shape of the other T type joint with a gap by the conventional TIG welding method. Further, FIG. 7 is a cross-sectional view of still another comparative example showing a multi-pass welding shape of another gap-attached T-type joint by a conventional TIG welding method.

  That is, in the conventional TIG welding method, since the penetration is shallow, as shown in FIG. 5 (1), in order to facilitate melting of the upper plate 1 and the upright plate 3, groove grooves 12 are formed on the surface portion of the upper plate 1. Formed and thinned. Then, as shown in (2) of FIG. 5, first, the thin-walled portion of the groove groove 12 is welded and melted to the upright plate 3 side to form the first layer welded portion 14. Thereafter, multi-pass welding is performed in which a plurality of laminated welds 15 are sequentially laminated up to the upper portion of the upper plate 1. Further, as another method related to the comparative example, as shown in FIGS. 6 (1) and (2), a large gap 13 of several millimeters is provided at a joint portion where two upper plates 1 and 2 are arranged in parallel, After welding the bottom part of this joint gap 13 and the space part of the lower upright plate 3 to melt up to the upright plate 3 side to form the first layer welded part 14, a plurality of laminated welded parts 15 are sequentially laminated to the upper part of the groove. Performs multi-pass welding. Further, as another method according to the comparative example, as shown in FIGS. 7 (1) and (2), a large joint gap 13 of several millimeters is formed at a joint portion in which two upper plates 1 and 2 are arranged in parallel. After the lower standing plate 3 and the left and right upper plates are each fillet welded 16, welding is performed to build up the central portion of the remaining joint.

  For this reason, the conventional TIG welding method shown in FIGS. 5, 6 and 7 requires multi-pass welding with increased man-hours and tends to result in increased welding deformation.

  In contrast, according to the T-type joint penetration welding method and penetration welded structure of the present invention, it is not necessary to form a groove groove or a large joint gap on the upper plate side, and one-pass welding with deep penetration is possible. A sound weld metal part that is melted from the upper plate surface to the lower vertical plate side and securely joins the upper plate and the lower vertical plate, and a tensile strength equal to or higher than the upper plate material strength (weld strength) ) Can be obtained. Moreover, there is no need to install a backing material, and no melting occurs. As a result, it is possible to reduce welding deformation, man-hours and costs as compared with conventional welding methods and weldments.

It is explanatory drawing which shows embodiment of the welding procedure concerning the penetration welding method of the T-shaped joint of this invention, and a penetration shape. It is explanatory drawing which shows other embodiment of the welding procedure concerning the penetration welding method of the T-shaped coupling of this invention, and a penetration shape. It is explanatory drawing which shows other embodiment of the welding procedure concerning the penetration welding method of the T-shaped coupling of this invention, and a penetration shape. It is explanatory drawing which shows embodiment of the laser welding procedure and penetration shape concerning the penetration welding method of the T-shaped joint of this invention. It is sectional drawing of the comparative example which shows the multipass welding shape of the T-shaped joint with a groove by the conventional TIG welding method. It is sectional drawing of the other comparative example which shows the multipass welding shape of the T-shaped joint with a gap by the conventional TIG welding method. It is sectional drawing of the further another comparative example which shows the multipass welding shape of the T-shaped joint with a gap by the conventional TIG welding method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 ... Top plate of T type joint, 3 ... Standing plate of T type joint, 4 ... Flux-cored wire, 44 ... Wire, 5 ... Non-consumable electrode, 6 ... Arc, 7a, 77a ... Molten pool, 7b, 77b ... weld metal part, 8 and 8b ... welding torch, 9a ... inner nozzle, 9b ... inert gas, 9c ... shield gas, 10a ... outer nozzle, 10b ... mixed gas containing oxidizing gas, 12 ... groove groove, 13 ... Joint gap, 14 ... First layer weld, 15 ... Laminate weld, 16 ... Fillet weld, 17 ... Laser torch, 18 ... Laser beam, 19 ... Focus position,
T1 ... Upper plate thickness, T2 ... Vertical plate thickness, w ... Vertical melt width, C ... Bead surface height, h ... Vertical melt depth, A ... Welding cross section of weld width W , B1 ... Upper plate cross-sectional area, L ... Defocus height

Claims (8)

It is a T-shaped joint made of stainless steel, and the range of the plate thickness T1 of the upper plate is 2 <T1 ≦ 6 mm, and the range of the plate thickness T2 of the upright plate is 2.5 of the plate thickness T1 of the upper plate. 2 times or more (2.5 x T1 ≤ T2 ≤ 5 x T1), and the upper plate surface that is arranged on the upper surface of the upper plate that is thicker than the plate thickness of the upper plate or two in parallel A method of melt-bonding from the upper plate surface to the lower vertical plate, which is butt-arranged, with shield gas supply means for flowing out an inert gas shield gas, or a shield containing an inert gas shield gas and an oxidizing gas A non-consumable electrode type arc welding is performed using a double shield gas supply means that flows out gas, and at the same time, a flux-cored wire filled with a flux agent that promotes penetration depth is fed to the arc welding part. However, it is melted by one-pass welding to the lower vertical plate In the through-welding method of the T-joint for joining,
By the one-pass welding, at least the melt width w on the standing plate side after penetrating the upper plate back surface is made larger than the plate thickness T1 of the upper plate (w> T1), or the penetration portion on the upper plate rear surface or the melt on the standing plate side A through-welding method for a T-shaped joint, characterized in that the weld cross-sectional area A of the width portion is formed larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1). It is a T-shaped joint made of stainless steel, and the range of the plate thickness T1 of the upper plate is 2 <T1 ≦ 6 mm, and the range of the plate thickness T2 of the upright plate is 2.5 of the plate thickness T1 of the upper plate. 2 times or more (2.5 x T1 ≤ T2 ≤ 5 x T1), and the upper plate surface that is arranged on the upper surface of the upper plate that is thicker than the plate thickness of the upper plate or two in parallel A method of melt-bonding from the upper plate surface to the lower vertical plate, which is butt-arranged, with shield gas supply means for flowing out an inert gas shield gas, or a shield containing an inert gas shield gas and an oxidizing gas A non-consumable electrode type arc welding is performed using a double shield gas supply means that flows out gas, and at the same time, a flux-cored wire filled with a flux agent that promotes penetration depth is fed to the arc welding part. However, it is melted by one-pass welding to the lower vertical plate In the through-welding method of the T-joint for joining,
A first step of configuring the shape of the T-shaped joint by arranging at least one upper plate that is thinner than the thickness of the standing plate on the upper surface of the lower plate in a stacked or two-sided arrangement in parallel;
By the one-pass welding, at least the melt width w on the standing plate side after penetrating the upper plate back surface is made larger than the plate thickness T1 of the upper plate (w> T1), or the penetration portion on the upper plate rear surface or the melt on the standing plate side Forming the weld cross-sectional area A of the width portion larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1), or setting both the melt width w and the weld cross-sectional area A to w> T1 and A> B1 A second step of forming
A through-welding method for a T-shaped joint. It is a T-shaped joint made of stainless steel material or low carbon steel material, and the plate thickness T1 range of the upper plate is 2 <T1 ≦ 6 mm, and the plate thickness T2 range of the vertical plate is the plate thickness T1 of the upper plate. Or more than 5 times (2.5 × T 1 ≦ T 2 ≦ 5 × T 1), and the upper plate surface that is arranged on the upper surface of the standing plate that is thicker than the plate thickness of the upper plate or In the T-type joint penetration welding method that melt-joins from the upper plate surface to the lower vertical plate arranged in parallel in two pieces,
The laser torch is arranged so that the focal position of the laser beam irradiated to the place to be welded is shifted upward from the surface of the upper plate, and laser welding is performed by the laser beam irradiation for defocusing, and at the same time, the wire is lasered. Melting up to the lower vertical plate while feeding to the welded portion, forming at least the melt width w on the vertical plate side after passing through the upper plate rear surface larger than the plate thickness T1 (w> T1), or the upper plate rear surface The welding cross-sectional area A of the penetration part or the melting width part on the vertical plate side is made larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1), or both the melting width w and the welding cross-sectional area A are w A through-welding method for a T-shaped joint, characterized in that it is formed to have a size of> T1 and A> B1. In the penetration welding method of the T type joint as described in any one of Claims 1 thru | or 3,
The melting width w on the standing plate side is formed larger than the plate thickness T1 of the upper plate (w> T1), and the bead surface height C on the upper plate side is 1 to 3 mm higher than the upper plate surface (1 ≦ C ≦ 3 mm) T-type joint penetration welding method characterized by forming a convex shape. It is a T-shaped joint made of stainless steel material or low carbon steel material, and the plate thickness T1 range of the upper plate is 2 <T1 ≦ 6 mm, and the plate thickness T2 range of the vertical plate is the plate thickness T1 of the upper plate. Or more than 5 times (2.5 × T 1 ≦ T 2 ≦ 5 × T 1), and the upper plate surface that is arranged on the upper surface of the standing plate that is thicker than the plate thickness of the upper plate or In a T-type joint penetration welded structure that is melt-bonded from the upper plate surface to the lower vertical plate arranged in parallel in two pieces,
The laser torch is arranged so that the focal position of the laser beam irradiated to the place to be welded is shifted upward from the surface of the upper plate, and laser welding is performed by the laser beam irradiation for defocusing, and at the same time, the wire is lasered. Melting up to the lower vertical plate while feeding to the welded portion, forming at least the melt width w on the vertical plate side after passing through the upper plate rear surface larger than the plate thickness T1 (w> T1), or the upper plate rear surface The welding cross-sectional area A of the penetration part or the melting width part on the vertical plate side is made larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1), or both the melting width w and the welding cross-sectional area A are w A T-type joint penetration welding structure characterized by having a structure including a weld metal portion formed in a size of> T1 and A> B1. It is a T-shaped joint made of stainless steel, and the range of the plate thickness T1 of the upper plate is 2 <T1 ≦ 6 mm, and the range of the plate thickness T2 of the upright plate is 2.5 of the plate thickness T1 of the upper plate. 2 times or more (2.5 x T1 ≤ T2 ≤ 5 x T1), and the upper plate surface that is arranged on the upper surface of the upper plate that is thicker than the plate thickness of the upper plate or two in parallel It is a structure that is melt-bonded from the upper plate surface to the lower vertical plate that are arranged in abutment, and that contains shield gas supply means that flows out the inert gas shield gas, or contains inert gas shield gas and oxidizing gas. A non-consumable electrode type arc welding is performed using a double shield gas supply means that flows out of the shielding gas, and at the same time, a flux-cored wire filled with a flux agent promoting penetration depth is fed to the arc welding part. However, by one-pass welding to the lower vertical plate In the through-welded structure of fusion bonding the T-shaped joint,
By the one-pass welding, at least the melt width w on the vertical plate side after penetrating the upper plate back surface is formed larger than the plate thickness T1 (w> T1), or the melt width on the through portion of the upper plate rear surface or the vertical plate side The weld cross-sectional area A of the portion is formed larger than the plate thickness cross-sectional area B1 on the upper plate side (A> B1), or both the melt width w and the weld cross-sectional area A are set to w> T1 and A> B1 A through-welded structure for a T-shaped joint, characterized in that the structure has a formed weld metal part. In the penetration welded structure of the T-shaped joint according to claim 5 or 6,
The melting width w on the standing plate side is formed larger than the plate thickness T1 of the upper plate (w> T1), and the bead surface height C on the upper plate side is 1 to 3 mm higher than the upper plate surface (1 ≦ C ≦ 3 mm) A through-welded structure for a T-shaped joint, characterized in that it has a structure including a weld metal part formed into a convex shape. In the penetration welded structure of the T-shaped joint according to claim 5 or 6,
The melt width w on the vertical plate side is larger than the plate thickness T1 (w> T1) by one-pass welding by the non-consumable electrode type arc welding or laser welding by the laser beam irradiation of the focal blur, or The weld cross section A is larger than the plate thickness cross section B1 on the upper plate side (A> B1), or both the melt width w and the weld cross section A are large (w> T1 and A> B1). Further, the weld metal part is formed in a T-type joint applied to any of nuclear equipment, thermal equipment, or automobile equipment, and a T-type joint penetration welded structure.

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