JP6242836B2 - Stud welding method - Google Patents

Description

  The present invention relates to a stud welding method, and in particular, a stud for welding a stud to a downward welding surface of a base material using a cylindrical ferrule having a stud insertion hole and disposed so as to surround the stud welding portion. The present invention relates to a welding method.

  Conventionally, when stud welding is performed, the flow of air in the vicinity of the welded portion is interrupted to prevent the metal melted by the generated arc from being oxidized by contact with air, and good welding is performed. In order to be able to do so, ceramic stud welding ferrules are used.

  For example, as shown in FIG. 6, this stud welding ferrule has a gas vent groove 34 in the end surface 33 of the peripheral wall 31 of the ferrule 3 in contact with the base material W, a hollow portion 32 in the peripheral wall 31, and an end surface 33. Stud insertion holes 35 are formed on the opposite sides of the ferrule 3 so that the peripheral wall 31 of the ferrule 3 surrounds the outer periphery of the welded portion of the stud S and is used by being attached to a stud welding gun (not shown). (For example, refer to Patent Document 1).

  By the way, in the conventional ferrule for stud welding, the high temperature gas generated by welding is ejected from the gap between the gas vent groove 34 and the stud insertion hole 35 and the stud S formed radially at the lower end of the ferrule 3, By preventing the surplus gas that cannot be ejected from hitting the inner peripheral surface of the peripheral wall 31 of the ferrule 3 and wrapping around the location where the molten metal and the base material W are in contact with each other, a defective weld location is prevented. The joint strength was sufficiently ensured.

Japanese Utility Model Publication No. 61-200666

  However, when the conventional ferrule for stud welding is used to weld the stud to the downward welding surface of the base metal, particularly a stud having a large diameter of 16 mm or more where a large amount of high temperature gas is generated by welding is welded. When used, the metal melted together with the high-temperature gas is ejected from the gap between the stud insertion hole 35 and the stud S, and the worker working underneath may be burned or the stud welding gun may be damaged. There is a problem that the weld metal is insufficient due to the ejection of the molten metal, and the joint strength of the welded portion cannot be sufficiently secured.

  In view of the problem when the conventional ferrule for stud welding is used for welding the stud to the downward welding surface of the base material, the present invention, when welding the stud to the downward welding surface of the base material, An object of the present invention is to provide a stud welding method capable of sufficiently securing the joint strength of the welded portion while preventing the molten metal together with the high-temperature gas from being ejected from the gap between the stud insertion hole and the stud.

  In order to achieve the above object, the stud welding method of the present invention uses a cylindrical ferrule having a stud insertion hole and disposed so as to surround the stud welding portion, and welds the stud to the downward welding surface of the base material. In the stud welding method, the difference between the diameter of the stud insertion hole and the diameter of the stud is set to 1 mm or less, and an open part for releasing the gas generated from the stud welded part at the time of stud welding in the radial direction is provided on the base material. The stud is welded so as to be formed at an area ratio of 20% to 50% within a range of 5 mm from the welding surface.

  In this case, the open portion may be constituted by a gas vent groove that crosses the annular contact surface with the weld surface of the ferrule base material.

  Moreover, the said open part can be comprised by the clearance gap set between the end surface of a ferrule and the welding surface of a base material.

  Moreover, the clearance setting mechanism which sets the said clearance gap can be attached to a welding apparatus.

  Further, the gap setting mechanism for setting the gap can be constituted by a gap setting piece provided on the end face of the ferrule.

According to the stud welding method of the present invention, by setting the difference between the diameter of the stud insertion hole and the diameter of the stud to 1 mm or less, particularly when used to weld the stud to the downward welding surface of the base material, Even when used to weld a stud with a large diameter of 16 mm or more, where a large amount of hot gas is generated by welding, the amount of hot gas ejected from the gap between the stud insertion hole and the stud can be suppressed. This prevents molten metal from being ejected together with high-temperature gas, burns down workers working underneath, damages the stud welding gun, and lack of weld metal due to molten metal ejection This can be prevented.
In addition, an open portion for releasing the gas generated from the stud weld portion in the radial direction at the time of stud welding is formed at an area ratio of 20% to 50% in a range of 5 mm from the weld surface of the base material. By welding the stud in this manner, it is possible to suppress the amount of surplus gas that cannot be ejected from the open portion, and thereby contact the inner peripheral surface of the peripheral wall of the ferrule and contact the molten metal with the base material. The joint strength of the welded portion can be sufficiently ensured in combination with the fact that the weld metal can be prevented from running around the location and causing poor welding and preventing the weld metal from being insufficient due to the ejection of the molten metal.

  In addition, the opening portion is constituted by a gas vent groove that crosses the annular contact surface with the weld surface of the ferrule base material, thereby forming the gas vent groove at an area ratio of 20% to 50%. An opening part can be comprised only by using the formed ferrule.

  Further, the opening portion is configured by a gap set between the end surface of the ferrule and the welding surface of the base material, so that the opening portion is configured only by appropriately setting the gap. Can do.

  In addition, the gap can be set easily and accurately by attaching a gap setting mechanism for setting the gap to the welding apparatus.

  Further, by configuring the gap setting mechanism for setting the gap with a gap setting piece provided on the end face of the ferrule, the gap can be set easily and accurately only by using the ferrule provided with the gap setting piece. it can.

It is explanatory drawing which shows an example of the ferrule used for the stud welding method of this invention. It is explanatory drawing which shows an example of the conventional ferrule. It is explanatory drawing which shows the clearance gap setting mechanism used for the stud welding method of this invention. It is explanatory drawing which shows an example of the ferrule used for the stud welding method of this invention. It is explanatory drawing which shows an example of the ferrule used for the stud welding method of this invention. It is front sectional drawing which shows the conventional ferrule.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a stud welding method of the present invention will be described based on the drawings.

  The stud welding method of the present invention uses cylindrical ferrules 1 and 2 that are provided with stud insertion holes 15 and 25 as shown in FIG. 1 or FIG. When welding the stud S (upward welding) in addition to the downward welding surface of W (including a downward welding surface parallel to the horizontal surface and a downward inclined welding surface), the diameter d of the stud insertion holes 15 and 25 The difference between the diameters of the studs S is set to 1 mm or less, preferably 0.8 mm or less, more preferably 0.6 mm or less, and an opening for releasing the gas generated from the stud welded portion in the radial direction during stud welding. The stud S is welded so that the portions 14 and 24 are formed in an area ratio of 20% to 50%, preferably 25% to 40% in a range of 5 mm from the welding surface of the base material W. It is.

  And in the ferrule 1 shown in FIG. 1, the open part 14 is the degassing groove | channel 14 which crosses the end surface 13 of the surrounding wall 11 of the ferrule 1 used as the cyclic | annular contact surface with respect to the welding surface of the preform | base_material W of the ferrule 1. It is configured.

Here, the ferrule 1 shown in FIG. 1 corresponds to the stud S having a diameter of 19 mm, and the difference between the diameter d of the stud insertion hole 15 and the diameter of the stud S is 0.6 mm, and the degassing groove as the opening portion 14 The area ratio of 14 is 27%, and the volume of the hollow portion 12 formed inside the peripheral wall 11 is 6500 mm ³ (1800 mm ³ with the stud S inserted).

Incidentally, the conventional ferrule 3 applied to the upward welding surface (downward welding) shown in FIG. 2 (FIG. 6) corresponds to the stud S having a diameter of 19 mm. The diameter d of the stud insertion hole 35 and the stud S The diameter difference is 1.3 mm, the area ratio of the gas vent groove 34 as the open portion 34 is 8%, and the volume of the hollow portion 12 formed inside the peripheral wall 11 is 6600 mm ³ (the stud S is The inserted state is 2000 mm ³ ).

  Further, in the ferrule 2 shown in FIG. 4, the open portion 24 is configured by a gap C set between the end surface 23 of the peripheral wall 21 of the ferrule 2 and the welding surface of the base material W.

In this case, in order to set the gap C, the gap setting mechanism 4 shown in FIG. 3 can be attached to the welding apparatus 5 and used.
The gap setting mechanism 4 includes a gap setting piece 42 that comes into contact with the welding surface of the base material W at three points in a state where the ferrule 2 is mounted in the hole 41 opened at the center. The gap C can be set easily and accurately.

Here, the ferrule 2 shown in FIG. 4 corresponds to the stud S having a diameter of 19 mm, the difference between the diameter d of the stud insertion hole 25 and the diameter of the stud S is 0.6 mm, and the area ratio of the open portion 24 is 30% (when the gap C is set to 1.5 mm), and the volume of the hollow portion 22 formed inside the peripheral wall 11 is 6000 mm ³ (1400 mm ³ with the stud S inserted). It has become.

  In addition, the end surface 23 of the peripheral wall 21 of the ferrule 2 is constituted by a surface parallel to the welding surface of the base material W of the ferrule 1, and the angle of the inner peripheral surface of the peripheral wall 21 as in the ferrule 2 shown in FIG. It is preferable to add a round R or an inclination (chamfering) to the part, and thereby, the flow of high-temperature gas generated by welding can be made smooth.

  3 to 4, the gap setting mechanism 4 is attached to the welding device (stud welding gun) 5. However, the gap setting mechanism for setting the gap C is a ferrule 2A shown in FIG. In this way, the gap setting piece 26 provided on the end surface 23 of the peripheral wall 21 of the ferrule 2A is configured, more specifically, for example, at the three points against the weld surface of the base material W when the ferrule 2A is manufactured. By embedding or attaching the needle-shaped gap setting piece 26 that comes into contact, the ferrule 2A is brought into contact with the welding surface of the base material W via the gap setting piece 26, so that the gap C can be easily and accurately provided. It can also be set.

Here, the ferrule 2A shown in FIG. 5 corresponds to the stud S having a diameter of 19 mm, the difference between the diameter d of the stud insertion hole 25 and the diameter of the stud S is 0.6 mm, and the area ratio of the open portion 24 is 30% (when the height h of the gap setting piece 26 is set to 1.5 mm), and the volume of the hollow portion 22 formed inside the peripheral wall 11 is 6000 mm ³ (in a state where the stud S is inserted). 1400 mm ³ ).

According to this stud welding method, the difference between the diameters of the stud insertion holes 15 and 25 of the ferrules 1, 2 and 2A and the diameter of the stud S is set to 1 mm or less, so that the stud S is formed on the downward welding surface of the base material W. , Especially when used for welding a large diameter stud S having a diameter of 16 mm or more where a large amount of high temperature gas is generated by welding, the stud insertion holes 15 and 25 and the stud S The amount of hot gas jetted from the gap can be suppressed, thereby preventing the molten metal from being jetted together with the hot gas, causing the operator working underneath to be burned or welding equipment (stud It is possible to prevent the welding gun) 5 from being damaged or the weld metal from being insufficient due to the ejection of molten metal.
In addition, the open portions 14 and 24 for releasing the gas generated from the stud welded portion in the radial direction at the time of stud welding have an area of 20% to 50% in a range of 5 mm from the weld surface of the base material W. By welding the studs S so as to be formed at a ratio, it is possible to suppress the amount of surplus gas that cannot be ejected from the open portions 14 and 24, and thereby, the peripheral walls 11 of the ferrules 1, 2, 2 A, This is combined with the fact that the molten metal and the base material W come into contact with the inner peripheral surface of the steel 21 and go around where the molten metal and the base metal W are in contact with each other, thereby preventing the occurrence of poor welding and preventing the molten metal from being blown out. Thus, the joint strength of the welded portion can be sufficiently secured.

  As mentioned above, although the stud welding method of this invention was demonstrated based on several embodiment, this invention is not limited to the structure described in the said embodiment, In the range which does not deviate from the meaning, the structure is suitably comprised. It can be changed.

  According to the stud welding method of the present invention, when the stud is welded to the downward welding surface of the base material, the molten metal together with the high temperature gas is prevented from being ejected from the gap between the stud insertion hole and the stud, and the joint of the welded portion is prevented. Since it has the characteristic which can fully ensure intensity | strength, it can be used suitably for the use which welds a stud to the downward welding surface of a base material.

DESCRIPTION OF SYMBOLS 1 Ferrule 11 Perimeter wall 12 Hollow part 13 End surface 14 Opening part (gas vent groove)
DESCRIPTION OF SYMBOLS 15 Stud insertion hole 2 Ferrule 2A Ferrule 21 Perimeter wall 22 Hollow part 23 End surface 24 Open part 25 Stud insertion hole 26 Gap setting piece 3 Ferrule 4 Gap setting mechanism 41 Hole part 42 Gap setting piece 5 Welding device (stud welding gun)
S Stud C Clearance

Claims (5)

  In the stud welding method in which a stud is welded to the downward welding surface of the base metal using a cylindrical ferrule having a stud insertion hole and arranged so as to surround the stud weld, the diameter of the stud insertion hole and the diameter of the stud The opening ratio for releasing the gas generated from the stud weld at the time of stud welding in the radial direction is 20% to 50% in the range of 5 mm from the weld surface of the base metal. A stud welding method comprising welding a stud so as to be formed by   The stud welding method according to claim 1, wherein the open portion is constituted by a gas vent groove that intersects an annular contact surface with a weld surface of a ferrule base material.   The stud welding method according to claim 1, wherein the open portion is configured by a gap set between an end surface of the ferrule and a welding surface of the base material.   The stud welding method according to claim 3, wherein a gap setting mechanism for setting the gap is attached to a welding apparatus.   4. The stud welding method according to claim 3, wherein the gap setting mechanism for setting the gap is constituted by a gap setting piece provided on an end face of the ferrule.

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