JPH0553778U - Auxiliary shield gas box for titanium welding - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] In TIG welding of titanium, which is an active metal, until the temperature around the welded part including the base material that has reached a high temperature reaches 450 ° C or lower to prevent embrittlement. Protect with inert gas. [Structure] A mechanism for supplying an auxiliary shield gas from a gas storage chamber 15 to a welding portion via a gas diffusion chamber 17 is provided, and it is possible to shield the invasion of the atmosphere between the gas box 5A and the plate to be welded. A flexible heat resistant cloth 20 is attached, and the height of the gas box in the longitudinal direction is tapered. Further, the gas box is installed at a joint portion which is engaged when the welding shield gas nozzle 3 is attached to the welding torch 2. It is an auxiliary gas shield box that has a mechanism to be attached to the welding torch. [Effect] The entire area around the welded part, which has become hot, can be shielded uniformly, and the quality is improved and stabilized. The improved workability shortens the training period of the welder, improves the skill level, increases the efficiency, and reduces the fatigue level.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an auxiliary shield gas box used as an accessory to a TIG welding torch in TIG welding titanium or a titanium alloy, which is one kind of active metal.

[0002]

[Prior Art]

 Titanium and titanium alloys are one of the active metals. When heated in the air, they easily oxidize and nitride from temperatures of around 450 ° C, forming brittle oxides and nitrides especially at high temperatures. Will not be able to demonstrate the performance of and will be a defective product. Therefore, when welding, including the weld metal, the heat-affected zone, and the surrounding base metal, make sure to completely shield it with an inert gas, such as argon gas, until it reaches a temperature of 450 ° C or less and contact it with the atmosphere. Must be prevented.

According to the Japan Welding Association standard WES7102-′83 “Inert gas arc welding work standard (titanium and titanium alloy)”, “the welding bead surface and its periphery are suitable nozzles for auxiliary gas shield (Note: nozzle here. In the following, it is necessary to prevent contamination by the atmosphere by using the nozzle of the association standard)). Therefore, it is necessary to shield with the auxiliary gas shield nozzle shown in Fig. 5. Recommended.

FIG. 5 is a perspective view showing a state in which an auxiliary gas shield nozzle is attached to a TIG welding torch. Reference numeral 2 denotes a tip portion of the welding torch, 3 is a shield gas nozzle for welding, and 4 is a tungsten electrode for generating an arc. A mounting metal fitting 6 is attached to the auxiliary gas shield nozzle 5, and the screw of the metal fitting 6 serves as a mechanism that allows the mounting and dismounting of the welding torch.

The gas conduit 8 for supplying the auxiliary shield gas 7 (arrow) is also arranged in a T shape in the gas diffusion chamber 10 in which the steel wool of the auxiliary gas shield nozzle is enclosed, and Gas discharge holes 9 are arranged in a line on the lower surface side of the conduit. The auxiliary shield gas 7 discharged from the gas discharge hole 9 is supplied to the welded portion from the gas diffusion chamber 10 in which the steel wool is enclosed, through the wire net 11.

FIG. 6 shows a cross-sectional view of a state where welding is performed using the auxiliary shield gas nozzle. It shows a situation in which an arc 14 is generated between the welded material 12 and the tungsten electrode 4 that have been butt-joined, and a welding wire (not shown) is fed to obtain a welding bead 13.

In this case, since the distance between the gas discharge hole 9 and the wire net 11 is small, the auxiliary shield gas 7 is not sufficiently diffused and is not sufficiently supplied to the left and right wall surfaces of the auxiliary gas shield nozzle. That is, in welding, the heat of conduction and radiant heat of the arc heat up to a width of about 20 mm from the welded part to the left and right, so it is necessary to protect the part with inert gas until the temperature drops to 450 ° C or less. However, since the nozzle for the auxiliary shield gas has the structural problem described above and cannot be shielded by the inert gas over the entire area of the nozzle, there is a case where there is a portion where the material is deteriorated due to partial oxidation. However, there is a problem that stable quality cannot always be obtained. Further, the gas conduit is T-shaped, and it is intended that the lower surface side of the T-shape, that is, the gas conduit portion arranged in parallel to the welding surface, is shielded by being aligned with the welding bead length direction. When operating the welding torch in the welding operation, it is very difficult to constantly match the gas conduit with the welding bead because the arc must be constantly advanced. In other words, it is an element that is easily influenced by individual skill. Furthermore, in the case of this nozzle, it is a structure that cannot prevent the invasion of outside air, and that the gap between the material to be welded and the lower side surface of the auxiliary shield gas nozzle must always be kept uniform depends on the skill of the individual. This is a factor that requires considerable skill.

Further, in order to attach and detach the auxiliary gas shield nozzle to and from the welding torch, the mounting metal fitting 6 is used. However, the weight is added by the weight of the mounting metal fitting 6, that is, the welding torch is Since it is operated with one hand, it is desirable that it be as light as possible. In a long-time welding operation, fatigue due to the added weight may affect the welding quality and cause a decrease in work efficiency. Further, the auxiliary shield gas nozzle needs to be strongly tightened so as not to slip off during welding, and there is a problem in that adjustment, attachment, and removal of the attachment position are complicated. On the other hand, there are currently no technical data or publicly known documents concerning this type of auxiliary shield gas nozzle.

[0009]

[Problems to be solved by the device]

 When welding active metals such as titanium and titanium alloys with a melting point of 1668 ° C, the temperature near the welded part including the base metal part, which has been heated to 450 ° C or more by welding heat, reaches to 450 ° C or less. The first issue is to provide a uniform shield with an inert gas such as argon, and the second issue is to provide a mechanism that prevents outside air from entering the area that is being shielded. The third issue is to make it an auxiliary gas shield nozzle that has an easy mechanism and is not easily influenced by the skill of the manufacturer, and requires a little skill to always obtain a weld of stable quality. ..

[0010]

[Means for Solving the Problems]

 The gist of the present invention is to provide a mechanism for supplying an auxiliary shield gas supplied from a gas conduit through a gas storage chamber and a gas diffusion chamber. The auxiliary shield gas box is surrounded by three sides and is flexible. When a heat-resistant cloth is attached and the auxiliary shield gas box is attached to the welding torch, the mechanism is such that the auxiliary shield gas box is sandwiched between the welding shield gas nozzle and the welding torch joint, and the height of the auxiliary shield gas box in the longitudinal direction is It is an auxiliary shield gas box for TIG welding, which is characterized by a structure with a taper.

[0011]

[Operation and Example]

 The workings and examples of the present auxiliary shielding gas box designed for use when welding active metals such as titanium and titanium alloys are detailed below. FIG. 1 is an overall perspective view showing a head portion of a welding torch when the auxiliary shield gas box of the present invention is attached to a welding torch for use.

Reference numeral 1 in FIG. 1 shows a tip portion of a grip portion of a welding torch, 2 is a welding torch main body, and 3 is a shield gas nozzle for welding. Reference numeral 4 denotes a tungsten electrode for generating an arc, and 5A is an auxiliary gas shield box of the present invention. Reference numeral 8 is a gas conduit for supplying the auxiliary shield gas, and a space indicated by 15 is a storage chamber for the auxiliary shield gas.

The supplied auxiliary shield gas 7 is sent to the gas storage chamber 15 through the gas conduit 8, and while filling the gas storage chamber, steel wool is filled from the auxiliary shield gas discharge hole 16. It is diffused in the auxiliary shield gas diffusion chamber 17. Next, the shield gas is provided with a secondary auxiliary shield gas discharge hole 19 (not shown) on the lower plate surface 18 of the auxiliary shield gas diffusion chamber 17, and is fed to the weld through the discharge hole. Reference numeral 20 is a flexible heat resistant cloth, and 21 is a metal fitting for fixing the heat resistant cloth. The flexible heat-resistant cloth 20 is provided on both side surfaces and the rear surface side of the auxiliary shield gas nozzle as shown in the figure except the advancing direction 23 side of the welding line 22 to prevent air from entering.

FIG. 2 is a sectional view (a) and an overall plan view (b) of the auxiliary shield gas box of the present invention seen from the welding advancing direction surface. The auxiliary shield gas 7, 7A sent through the gas conduit 8 (FIG. 2 (b)) is sent to the rear gas reservoir chamber 15 from the left and right, avoiding the welding shield gas nozzle, and the gas reservoir chamber 15 (FIG. 2 (a)), the gas is diffused while passing through the voids of the steel wool in the steel wool-enclosed gas diffusion chamber 17 in the lower stage, and is uniformly sent to the welded portion through the secondary gas discharge small hole 19. Be paid.

FIG. 3 is an example of a welding torch that is generally commercially available. Usually, the shield gas nozzle 3 for welding is a kind of consumable product because it is necessary to remove and clean the gas nozzle 3 when spatter adheres, or when it is damaged, it must be replaced. For this reason, the mechanism for mounting and dismounting is such that it is screwed in via the screw portion 24 for mounting. According to the present invention, the torch body 2 and the welding shield gas nozzle 3 are installed so that the auxiliary gas shield box of the present invention is sandwiched by the joint portion 25 indicated by the arrow, and the welding gas shield box 3 is screwed in and installed. Auxiliary shield A mechanism that fixes the gas box.

That is, as shown in the figure, the auxiliary shield gas box 5 is attached with a cylindrical pipe 26 through which a welding shield gas nozzle can pass, and is sealed so as not to release the auxiliary shield gas. The circular hole provided on the top plate of the gas box is slightly smaller than the cylindrical pipe 26 and has the same size as the inner diameter of the joint portion 25 of the welding shield gas nozzle. It is fixed as if it is sandwiched between parts.

Next, FIG. 4 is a side view showing a state where the auxiliary shield gas box of the present invention is attached and welded. In a normal welding operation, the welding torch 2 is inclined rearward with respect to the very welding progress direction 23 shown in FIG. It is said that the inclination angle 27 should be about 15 degrees. Therefore, the lower surface side of the auxiliary shield gas box 5 is inclined at about 15 degrees so that the gap between the welded plate 14 and the lower surface of the auxiliary shield gas box is almost the same height over the entire width in the longitudinal direction of the shield gas box. A taper angle of 28 is provided. As a result, the welding operation became stable and possible.

Examples will be described below. According to WES8104-′83 “Testing method and judgment standard in titanium welding technology certification”, it is stipulated to carry out “visual inspection” and “bending test”, and in the external appearance test, there are “harmful defects”. It is not allowed ”, and the degree of discoloration of welds and the criteria for judgment are stipulated as shown in Table 1. In other words, the degree of oxidation and nitriding is judged by the color, but the samples judged as discolored by the discolored color generally fail in the bending test.

[0019]

[Table 1]

When welding is performed to 16 welders under training according to the WES8104 standard by using the conventional auxiliary gas shield nozzle and by using the auxiliary shield gas box of the present invention, two pieces each are welded Table 2 shows the results of the appearance test performed on the sample.

The pass rate of the sample when welded using the auxiliary shield gas box of the present invention was 87.5%. The acceptance rate of the sample welded using the conventional method auxiliary gas shield nozzle was about 65.6%. The fact that there was a difference of about 20% between the two means that a significant difference was recognized between the two, and if welding is performed using the auxiliary shield gas box of the present invention, the pass rate is high. It shows that things can be obtained.

That is, when welding is performed using the auxiliary gas shield box of the present invention, a slight gap occurs between the welding bead longitudinal direction and the longitudinal direction of the shielding gas box due to the provision of the independent gas reservoir chamber. However, since the shielding gas is supplied all over the shielding gas box, the rejection rate is low, and the arc is easy to see, and the workability is high because of the ease of welding without being affected by the outside air. It can be said that a comprehensive advantage in terms of functionality was confirmed because no special skill was required.

[0023]

[Table 2]

[0024]

[Effect of the device]

 When titanium and titanium alloys are welded by the TIG welding method using the auxiliary shielded gas box of the present invention, the temperature of the region including the weld metal, the heat-affected zone, and the base metal portion that has become hot due to welding heat The shielding gas is supplied until the temperature becomes 450 ° C or less, so that the deterioration in quality due to oxidation and nitriding can be prevented, and there is an effect that the quality of the welded part and the pass rate are improved. In addition, the improved operability of the welding torch made it easier to master the welding skill, and the effects of reducing fatigue and improving efficiency of the welding operator were obtained.

[Submission date] April 23, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

The supplied auxiliary shield gas 7 is sent to the gas storage chamber 15 through the gas conduit 8, and while filling the gas storage chamber, steel wool is filled from the auxiliary shield gas discharge hole 16. It is diffused in the auxiliary shield gas diffusion chamber 17. Next, the shield gas is provided with a secondary auxiliary shield gas discharge hole 19 (not shown) on the lower plate surface 18 of the auxiliary shield gas diffusion chamber 17, and is fed to the weld through the discharge hole. Reference numeral 20 is a flexible heat resistant cloth, and 21 is a metal fitting for fixing the heat resistant cloth. The flexible heat-resistant cloth 20 is provided on both side surfaces and the rear surface side of the auxiliary shield gas box as shown in the figure, except for the traveling direction 23 side of the welding line 22, to prevent air from entering.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction content]

FIG. 3 is an example of a welding torch that is generally commercially available. Usually, the shield gas nozzle 3 for welding is a kind of consumable product because it is necessary to remove and clean the gas nozzle 3 when spatter adheres, or when it is damaged, it must be replaced. For this reason, the mechanism for mounting and dismounting is such that it is screwed in via the screw portion 24 for mounting. In the present invention, the auxiliary gas shield box of the present invention is installed so as to be sandwiched between the torch body 2 and the welding shield gas nozzle 3 which are in contact with each other by the joint portion 25 indicated by an arrow, and the welding gas shield nozzle 3 is screwed in to be installed. This mechanism fixes the auxiliary shield gas box.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

That is, as shown in the figure, the auxiliary shield gas box 5 A is attached with a cylindrical pipe 26 through which a welding shield gas nozzle can pass and is sealed so that the auxiliary shield gas is not discharged. The circular hole provided on the top plate of the auxiliary shield gas box is slightly smaller than the cylindrical pipe 26 and has the same size as the inner diameter of the joint portion 25 of the shield gas nozzle for welding. Is fixed as if it is sandwiched between seams.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

Next, FIG. 4 is a side view showing a state where the auxiliary shield gas box of the present invention is attached and welded. In a normal welding operation, the welding torch 2 is inclined rearward with respect to the very welding progress direction 23 shown in FIG. It is said that the inclination angle 27 should be about 15 degrees. Therefore, the lower surface side of the auxiliary shield gas box 5A is inclined at about 15 degrees so that the gap between the welded plate 12 and the lower surface of the auxiliary shield gas box is substantially the same height over the entire width in the longitudinal direction of the shield gas box. A taper angle of 28 is provided. This enabled stable welding work.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

[0023]

[Table 2]

[Procedure Amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction content]

[0024]

[Effect of the device]

When titanium and titanium alloys are welded by the TIG welding method using the auxiliary shielded gas box of the present invention, the temperature of the region including the weld metal, the heat-affected zone, and the base metal part which has become hot due to welding heat It is possible to prevent the material deterioration due to oxidation and nitriding by feeding the shielding gas until the temperature becomes 450 ° C or less, and it is effective in improving the quality of the welded part and improving the pass rate. In addition, the improved operability of the welding torch made it easier to learn the welding skill, and the effects of reducing fatigue and improving efficiency of the welding operator were obtained.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing a state in which an auxiliary shield gas box of the present invention is attached to a welding torch.

FIG. 2A is a front side sectional view and FIG. 2B is an overall plan view showing a state where the auxiliary shield gas box of the present invention is attached to a welding torch and welded.

FIG. 3 is a view showing a position where an auxiliary shield gas box of the present invention is attached to a welding torch, and a sectional view of the welding torch to which the shield gas box is attached.

FIG. 4 is a view showing a state of taper processing applied to the auxiliary shield gas box of the present invention, which is a side view in a welding direction showing a state of being attached to a welding torch and welding.

FIG. 5 is an overall perspective view showing a state in which a conventional auxiliary shield gas nozzle is attached to a welding torch.

FIG. 6 is a front cross-sectional view showing a state where welding is performed using a conventional auxiliary shield gas nozzle.

[Explanation of symbols] 1 Welding torch gripping part 2 Welding torch 3 Welding shield gas nozzle 4 Tungsten electrode 5 Auxiliary gas shield nozzle 5A Auxiliary shield gas box 6 Auxiliary gas shield nozzle mounting bracket 7, 7A Shield gas 8 Shield gas conduit 9 Shield gas Release hole 10 Steel wool-filled gas diffusion chamber 11 Shield gas release wire mesh 12 Welded plate 13 Weld bead 14 Welding arc 15 Shield gas reservoir chamber 16 Primary shield gas release hole 17 Shield gas diffusion chamber 18 Shield gas diffusion chamber bottom plate 19 Secondary shield gas discharge small hole 20 Flexible heat resistant cloth 21 Heat resistant cloth fixing metal fitting 22 Welding line 23 Welding advance direction 24 Mounting screw part of welding shield gas nozzle 25 Joint part of torch and welding shield gas nozzle 26 Cylindrical pipe 27 Welding torch tilt 28 taper angle of the shield gas box

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[Procedure amendment]

[Submission date] April 23, 1992

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (1)

[Scope of utility model registration request] 1. An auxiliary shield gas box used for TIG welding titanium or titanium alloy, wherein the auxiliary shield gas supplied from a gas conduit is supplied through a gas reservoir and a gas diffusion chamber. A flexible heat-resistant cloth is attached to the auxiliary shield gas box so as to surround the three sides, and when the auxiliary shield gas box is attached to the welding torch, a mechanism is used so that the auxiliary shield gas box is sandwiched between the welding shield gas nozzle and the joint portion of the welding torch. An auxiliary shield gas box for TIG welding, which has a structure in which the height of the shield gas box in the longitudinal direction is tapered.