JPH10225772A - Nozzle and welding torch of arc welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply remove a spatter stuck on the inside face by winding a nozzle with an elastic sheet in a spiral like and forming with piling a partial of an adjoining coil part without clearance over the total circumference. SOLUTION: When welding is executed, a spatter 9 is stuck on the inside face of a nozzle 7. In this case, the nozzle 7 is pressed along the center axial line with the force more than a definite force. Then, a coil part of a small diameter of the nozzle 7 is pressed in the inside of the coil part of the large diameter side. In this time, because there is no clearance between both side parts, the spatter stuck on the inside face of the large diameter part is slid down with the lower end edge of the coil part of the adjoining small diameter side. In such a way, the spatter 9 stuck on the inside face of the nozzle 7 is removed simply. On the result, the stream of a shield gas can be kept in the normal state over the long time, the generation of defective welding is prevented and the frequency for changing the nozzle 7 is also decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a welding torch in a nozzle and an arc welding machine.

[0002]

2. Description of the Related Art A welding torch of an arc welding machine includes a nozzle for injecting a shielding gas such as a carbon dioxide gas, and a tip installed inside the nozzle. The tip has a hole for guiding a wire automatically supplied from the wire supply device to a welding site, and the welding wire receives electric power for arc generation when passing through the hole of the tip.

[0003] In this welding torch, an arc is generated between the tip of a welding wire and an object to be welded, and the heat of the arc causes the welding surface of the wire and the object to be welded to melt. To be welded in a shield gas atmosphere.

[0004] In arc welding using such a welding torch, it is inevitable that fine metal particles (spatter) melted during welding are scattered and adhere to the inner surface of the nozzle. The remarkable spatter adhesion on the inner surface of the nozzle causes the drift and stagnation of the shielding gas, reduces the shielding effect between the atmosphere and the welded part, and generates bubbles (blow holes) in the welded part.
And welding defects such as minute holes (pinholes).

[0005] Further, if the sputters accumulate and the nozzle and the chip are electrically connected by the spatter, a short circuit (spark) occurs when the nozzle comes into contact with the workpiece, and the torch may be damaged. Therefore, it is necessary to remove spatters attached to the inner surface of the nozzle as soon as possible.

[0006]

However, in the conventional welding torch nozzle, when removing spatter adhered to the inner surface, for example, a pointed object such as a screwdriver is inserted through the opening at the nozzle tip to cut the spatter. There is no alternative but to drop the paper or wrap a paper file around the rod member and insert it into the nozzle to scrape off the spatter. Therefore, there is a problem that it takes a lot of time to remove the spatter.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and provides a nozzle and a welding torch of an arc welding machine capable of easily removing spatters adhered to an inner surface. The purpose is to:

[0008]

SUMMARY OF THE INVENTION The present invention relates to a nozzle and a welding torch of an arc welding machine, and is constituted as follows to solve the above-mentioned technical problem. That is, the nozzle of the present invention is formed by spirally winding a plate material having elasticity, and forming a part of the adjacent coil portion over the entire circumference without any gap.

By pressing the nozzle along its central axis, the small-diameter coil portion is pushed into the large-diameter coil portion. At this time, the inner peripheral surface of the large-diameter coil portion is rubbed against the outer peripheral surface of the small-diameter coil portion inserted therein.

The present invention also provides an arc welding machine comprising: a nozzle for injecting a shielding gas into a welding portion; and a tip installed in the nozzle for guiding a welding wire to a welding site and supplying power to the welding wire. In the above welding torch, the nozzle is the above-mentioned nozzle.

The welding torch of this arc welding machine can easily remove spatters attached to the inner surface of the nozzle.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a nozzle and a welding arch of an arc welding machine according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is an exploded perspective view of an arc welding machine using carbon dioxide as a shielding gas, that is, a welding torch 1 of a carbon dioxide arc welding machine. The welding torch 1 includes a torch body 3 connected to a tip of a torch holder 2, an insulating joint 4, a baffle 5, a tip 6, and a nozzle 7. The chip 6 is made of a magnesium alloy (MD1D, M
D2B), for example, by die casting.

As shown in FIG. 2, the nozzle 7 is formed by spirally winding a plate material having elasticity, for example, a spring steel such as a stainless steel strip for a spring or a steel strip for a spring in the present embodiment. A part of the part is formed so as to overlap a part of the adjacent large-diameter side coil part without a gap over the entire circumference.
In the present embodiment, each coil portion is formed so as to overlap the length B2 from the end of the width B1.

As shown in FIG. 3, when the nozzle 7 is pressed along the central axis with a force F which is equal to or greater than a predetermined value, the small-diameter coil portion is entirely embedded in the adjacent large-diameter coil portion. It is to be pushed.

The material shape of the nozzle 7 is shown in FIG.
(A) A long plate 7 having a uniform width B1
1 or a long plate material 72 whose maximum width B1 gradually decreases along the length direction as shown in FIG. Both ends of these plate members 71 and 72 are cut off diagonally. Thereby, the plate members 71 and 72
When spirally wound, the both ends of the nozzle 7 can be perpendicular to the central axis.

A tubular power supply (not shown) made of a tungsten alloy is inserted into the tip of the chip 6 in FIG. The exposed surface of the chip 6 can be prevented from being sputtered by applying a fluororesin coating or Nimflon plating.

A welding wire (not shown) supplied from the wire supply device is inserted into the through hole 6a of the tip 6 through the torch body 3 and automatically passes through the nozzle 7 to a welding portion in front of the nozzle 7. Supplied. When the welding wire passes through the through hole 6a of the tip 6, electric power for arc generation is supplied from the tip 6.

The joint 4 insulates between the torch body 3 and the nozzle 7. The baffle 5 rectifies the shield gas supplied through the torch body 3 and supplies the same to the nozzle 7.
Further, the baffle 5 is formed of an insulating material such as ceramics, and prevents an electrical short circuit between the torch body 3 and the nozzle 7 due to spatter attached to the nozzle 7. The nozzle 7 can be directly fixed to the joint 4 by brazing or the like, or can be fixed to the joint 4 using another attaching means.

The shielding gas supplied into the nozzle 7 is
The welding portion of the workpiece is melted by the heat of the arc generated between the tip of the welding wire and the welding site of the workpiece, and is cut off from the atmosphere.

When welding is performed using the welding torch 1 and the spatter 9 adheres to the inner surface of the nozzle 7 as shown in FIG. 5A, the nozzle as shown in FIG. 7 is pressed with a force F that is equal to or greater than a predetermined value along the central axis. Then, the small-diameter coil portion of the nozzle 7 is pushed into the adjacent large-diameter coil portion.

At this time, since there is no gap between the coil portion on the small diameter side and the coil portion on the large diameter side adjacent thereto, the sputter 9 adhering to the inner surface of the coil portion on the large diameter side is reduced.
It is scraped off at the lower edge of the adjacent small diameter coil portion. Therefore, the sputter 9 adhered to the inner surface of the nozzle 7
Can be easily removed, whereby the flow of the shield gas can be maintained in a normal state for a long period of time, and the occurrence of welding defects (blow holes and the like) can be prevented. Further, the life of the nozzle 7 can be extended, and the frequency of replacement is reduced, which is economical.

[0023]

As described above, according to the present invention,
By pressing the nozzle along the central axis, the inner surface of the large-diameter side coil portion is rubbed by the edge of the small-diameter side coil portion, so that spatter adhered to the nozzle inner surface can be easily removed. Therefore, the shielding gas is normally injected, so that welding defects are less likely to occur, and an excellent effect of improving the quality of welding is achieved. In addition, there is an advantage that the life of the nozzle can be extended and the frequency of replacement can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a welding torch of an arc welding machine according to the present invention.

FIG. 2 is a view showing a nozzle of a welding torch of the arc welding machine according to the present invention.

FIG. 3 is a cross-sectional view showing a state in which a nozzle of a welding torch of the arc welding machine according to the present invention is pressed along a central axis.

FIG. 4 is a development view showing a material shape of a nozzle of a welding torch of the arc welding machine according to the present invention.

FIG. 5 is a diagram illustrating the operation of the nozzle of the welding torch of the arc welding machine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding torch 6 Tip 7 Nozzle 71, 72 Plate material

Claims (2)

[Claims] 1. A nozzle formed by spirally winding a plate material having elasticity and overlapping a part of an adjacent coil portion over the entire circumference without any gap. 2. A welding torch for an arc welding machine, comprising: a nozzle for injecting a shielding gas into a welding portion; and a tip installed in the nozzle for guiding a welding wire to a welding site and supplying power to the welding wire. A welding torch for an arc welding machine, wherein the nozzle is the nozzle according to claim 1.