JPS60102278A - Gas shielding device for stud welding gun - Google Patents

Abstract

PURPOSE:To provide a titled shielding device which eliminates completely the turbulence of gas, decreases blowholes in the reinforcement of weld and to perform secure stud welding by ejecting the shielding gas from the tip of a long shielding cylinder enclosing the operating rod, chuck and stud of a welding gun. CONSTITUTION:A long shielding cylinder 20 enclosing the operating rod 6, chuck 10 and stud S of a stud welding gun is attached 21 to the base part of the rod 6. The shielding gas entering through a conduit 15 passes through a passage 13 and a gap G and is blown uniformly from the circumference of the stud S to the weld zone. The turbulence in the weld zone is completely eliminated as the gas is uniformly and stably blown. The blowholes in the reinforcement of weld in the weld zone are decreased and the stud welding is satisfactorily accomplished.

Description

[Detailed description of the invention] Raiko 1 row I'□j, Stand welding (Related to a device that shields the arc between the stand gripped by Kou and the base metal with shielding gas, the purpose of which is to eliminate the glow that occurs in an extra 1 inch. An object of the present invention is to provide a gas shielding device 1t which can significantly reduce holes and perform strong stand welding.

-The crotch stand welding gun covers the tip of the stand with ferrule gold, and the shielding gas is fed into the foot of the lvr which surrounds this. In this conventional device, the shielding gas flows in the opposite direction to the gas generated from the M melt during welding, which causes turbulence inside the ferrule. There is a flaw in that the stand's 1" g (strong) V is weak because a multi-I anti-protrusion occurs in the rest surrounding the stand.

The present invention provides a welding gun with a stand, a chuck, and a guide (it-shaped shielding tube) that surrounds the parts of the IW, and the tip of the shielding tube.
By ejecting the sealing gas from 1 hour so that it flows in the same direction as the high I crystal gas of the melt, and eliminating any turbulence of the shielding gas, we have achieved a glow ball with five wins in aluminum stand welding. They succeeded in significantly reducing the amount of aluminum and producing an aluminum stand that was extremely firmly welded to the base metal.

In the embodiment shown in Figures 1 and 2, the main body is connected to the lug, a 4-magnet (not shown) with an excitation coil is built into the cylindrical core, and two cords 2 and 3 are inserted. A switch 5 is provided at the base of the grip 4, and an operating rod 6 is connected to a movable iron core that loosely fits into the core and projects from the front surface of the main body 1. Reference numeral 7 designates two wooden J push rods installed directly below the operating rod 6, whose bases are tightly screwed into the front lower part of the main body 1 and extend long toward the front of the operating rod 6.
Three needle-like protrusions 9 are planted on a thick foot piece 8 fixed at the tip, and when welding the stand S, the protrusions are pressed against the base material P to prevent the welding gun from wobbling. 10 is i on the operating rod 6
lI! With a chuck, the rear end is firmly fitted into the recess 11 on the end face of the operating rod to connect them together, and the stand S is gripped with appropriate strength using several δ grooves 12 cut in the axial direction. .

On the center line of the operating rod 6, several outlets 17 were opened at equal angles by attaching a deflection 1+116 to the outside of the tip of the shielding argon gas, and the shield was fed into the operating rod through the V-build 15. The gas G is evenly discharged from the outer peripheral surface of the tip 111d. 20 is a long cylindrical shielding tube that surrounds the tip of the stand S from the middle part of the operating rod 6 through the chuck 1o, and the tip ν1''1d of this shielding tube 2o is a core hole made in the leg piece 8. 18 WjJ <Bottom, generalize both as one.

By fitting together, the thrust tube 2 ( ) is fixed to the body 1 via the leg rod 7 . The cylindrical cylinder 2o is equipped with a metal 21♂ snake inside and outside of M+; a short convex one-inch stopper 22 is housed in the operating rod 6.
The metal 21 and the sealing cylinder 22 close the rear end of the shielding cylinder 2o without interfering with the movement of the operating rod 6. The self-contained tube 20 has a mesh filter 23 on the inner surface near the tip.
Attach 1 and measure the flow of shielding gas, light 1) 1□
1-Narrow the j111 spacing of the stud S (!: by tightening the busy push 24 firmly and making the rear face 25 of the bush tapered so that the shield gas flows smoothly.

An example of "Ki-ni 19" has the above configuration, and when welding the stud S to the busbar 1), the stand S is chucked to the
Place the tip I'+1 cloth on the No. 1 material P, holding the grip 4 and press the protrusion 9 of the foot (1-) onto the Iμ material, keeping the welding gun from wobbling and pressing the switch 5. When switch 5 is turned 1, stud S goes to mU'P +I; 4
At the same time, a large current flows (Nl+Jft4), which energizes the electromagnet, causing the operating rod 6 to retreat slightly, advancing the tip of the stud from the base material P, and generating a strong arc between them. As a result, the tips of the studs 1'', 1<, I-4', and A were partially melted due to the Joule heat of the arc current, and after the time set on the timer, the stud S was released. (not shown), −7−t−=−1−
The molten material that has risen by 1≠1 solidifies and becomes an overfill (not shown), the stud S is welded to 4 points P, and its base is surrounded by the overfill.

The gas shielding device provided in the conventional stud welding gun is: ・I
As shown in Fig. S3, a foot 30 with a shallow dish-shaped cross section and a seven-ferrule 33 made of fireproof porcelain are used.Two wooden tubes 31, 31 are attached to the end face of the foot 30, a core hole 32 is drilled, and the ferrule 33 is also Drill a core hole 34 on the end [/ji and 1; all 1 on the edge? A greedy -J-inclusive 35 is provided in 'fl, and the 7-toe 30 is placed in the leg rod 7, and the ferrule 33 that is placed over the tip of the stand S is grasped, and the core hole 32° 3 of both is inserted.
An annular bathoxyg 36 is interposed between the edges of the holes 4 and 4.

This rice production device sends shielding gas G to 1X1- of 7-to 30 during welding, and the shielding gas
From there, it flows into the ferrule 33 and fills the entire inside of the ferrule, blocking the arc between the stand and the fJi material. By the way, the tip of the stud S and the -1 part of the IU contact P are melted by the Joule heat of the arc'fit flow, generating a large amount of high-temperature gas, and the t'J material is subjected to sub-edge chamfering. If the gas is leaking, the high-temperature gas will become particularly hot, and some of it will flow northward through the core holes 34 and 32.
Most of it flows to the side and flows out from t) J-in 35. Since the flow of shielding gas G is in the opposite direction to this high temperature gas flow, a turbulent flow is generated within the ferrule, which causes a greedy glow hole to occur in the excess when welding aluminum studs in the rice production equipment. A serious flaw is that the welding strength of the studs is weak.

The wooden example is made by adding +7fi to tube 15 during welding.
A high-pressure shielding gas is sent to the flow path 13 in the vJ rod, and the conogas flows out randomly from a large number of outlets 17 formed in the annular groove 16 and fills the inside of the shielding cylinder 2o. Since the rear end of the shielding tube is closed with the metal 21 and the sealing tube 22, the shielding gas flows to the tip along the same surface of the chuck 1o,
After passing through the mesh filter 23 and being rectified, it is squeezed by the bush U and flows along the 111 plane of the tip of the stud S in the axial direction, and is ejected from the tip of the shielding cylinder 20 (
]) Material PKfA flows evenly in all directions between the protrusions 9, 9. This shielding gas G shields the arc that occurs between the tip of the stand and the base material P, suppresses the molten material due to the Joule heat of the arc current, and forms a peak, and the high temperature gas generated from the molten material. Since it flows in the same direction as the shielding gas, both of them form a laminar flow, and unlike the conventional method (A), turbulence does not occur, so the blowball of excess metal in aluminum stud welding is significantly reduced, and the base metal The welding strength of the stud increases over time.

The above is an explanation of one embodiment of the present invention.
J can be designed within the gist of the invention without being limited to this actual example, and can also be used for stand welding of soft needles (4).

In the case of "Zero firing", the welding gun is equipped with a stand, a chuck, and a cylindrical shielding tube that surrounds the made J rod, and the shielding gas is ejected from the tip of the shielding tube to release the molten material. This allows the high-temperature gas to flow in the same direction as the gas under the seal, and as there is no turbulence in the gas under the seal, the blowball of the excess metal is significantly reduced, resulting in strong stud welding against the base material. It has a useful effect.

[Brief explanation of the drawing]

The drawings show an embodiment of the stud welding gun for use with wood. Fig. 1 is a side view of a stud welding gun that shows the embodiment, Fig. 2) is an enlarged sectional view of the main parts of the embodiment, and Fig. 4153 is a conventional one. FIG. 2 is a cross-sectional view of the device. 1 is the main body of the welding gun, 6 is the operating rod, 7 is the leg rod, 8 is the foot piece, 9 is the protrusion, 10 is the chuck, S is the stand, G is the shielding gas, 13 is the flow path in the operating rod, 17 is the exit, 18
is the core hole of the leg piece, 20 is ・t! It is a masking tube. Figure 1

Claims (1)

[Claims] A chuck that grips the stud is connected to the operating rod that protrudes from the body of the welding gun, and a chuck that grips the stud is attached to the tip of the first rod that comes out of the main body.
Fix the leg with C and connect the shielding gas flow path to the operating rod.
A long cylindrical sieve tube is installed that extends from the middle of the operating rod through the chuck and surrounds the stud near the tip. The tip of the cylinder is inserted into the core hole of the leg piece to open it, and the rear end is closed, so that during welding, the trapped shield gas is sent into the cylinder and ejected from the tip. Gas 31I shielding device for stand welding gun.