JPS63199080A - Pulse tig welding method - Google Patents

Abstract

PURPOSE:To perform the welding with the deep penetration or the welding with the sufficient build-up by delaying the feed and stoppage of a filler wire with respect to a pulse current. CONSTITUTION:A point of time of starting to feed the filler wire 8 is delayed from a point of rise time of the pulse current and a point of time of stopping to feed the filler wire 8 is delayed from a point of breaking time of the pulse current by using a controller. Such delay is carried out for each pulse of the pulse current. Furthermore, the delay time can be optionally changed by adjusting the volume of the controller. In this way, since the filler wire 8 is fed after the sufficient penetration is obtained on material 9 to be welded, the welding with the deep penetration 12 is performed. Furthermore, since the wire 8 is delayed to stop with respect to the pulse current, the sufficient build-up 13 is obtained.

Description

[Detailed description of the invention] 8. Industrial application field The present invention is a method for intermittently feeding a filler wire (filler metal) to a welding location of a welded material and supplying a pulsed current to an electrode of a torch. The present invention relates to a pulsed TIG welding method in which welding is performed using pulsed TIG welding.

b. Prior art In this type of conventional pulse TIG welding method, the fourth
As shown in Figures (^) and (III), the torch electrode and filler wire are moved along the welding location of the workpiece at predetermined time intervals 1. Welding is performed by supplying pulsed current a (welding current) to the electrode of the torch while moving the torch intermittently, and feeding the filler wire over time t2 in synchronization with this pulsed current a. was. That is,
The rise of the pulse current a and the start of feed of the filler wire are synchronized with each other, and the fall of the pulse current a and the stop of feed of the filler wire are completely synchronized.

Problems that the C0 design aims to solve However, in the conventional method as described above, the pulse current a and the feed timing of the filler wire were made to perfectly match, so it was difficult to weld with deep penetration or filler wire. In some cases, it was difficult to weld with sufficient material buildup, and it was not possible to perform good welding.

The present invention has been made in view of these circumstances, and its purpose is to achieve at least one of deep welding and welding with a sufficient amount of filler metal. Pulse TI that allows good welding
The object of the present invention is to provide a G welding method.

d. Means for Solving the Problems In order to solve the above problems, the present invention intermittently feeds the filler wire to the welding location of the material to be welded, and at the same time supplies a pulsed current to the electrode of the torch. In the pulsed TIG welding method, the feed of the filler wire is delayed from the rise of the pulse current, and the feed of the filler wire is stopped at the fall of the pulse current. At least one of the operations to delay from the point in time is performed.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows the configuration of an automatic TIG welding device that implements the pulsed TIG welding method according to the present invention, in which 1 is a TIG welding machine, and 2 is a filler wire for pulsed current (welding current). 3 is a welding wire feeding device that operates based on a control signal from the control device; 4 is a torch; 5 corresponds to the torch 4; This is the guide tip for the filler wire arranged.

The above-mentioned torch 4 is equipped with a gas tip 6 and an electrode 7, as shown in FIG.
is configured to be supplied. Further, the filler wire 8 sent out from the feeding device 3 is guided by a guide tip 5, and its tip is arranged near the welding part of the workpiece 9.

Next, the operation and effect of welding using this automatic 74G welding device will be described.

First, when the material to be welded 9 is placed in a predetermined position, the torch 4
and automatic operation bag M (Robofft) with guide chip 5 not shown.
The parts are placed corresponding to the welding points and the welding work begins.

That is, a pulse current a is supplied from the tIc welding machine 1 to the electrode 7 of the torch 4, and the filler wire 8 is fed by a predetermined amount from the feeding device 3 to be melted. Torch 4 is stopped at the same time.
The guide tip 5 is intermittently moved by a predetermined distance along the welding location of the welded material 9. Then, the above-mentioned operation is repeated for each pulse, and as a result, the material to be welded 9 is welded as shown in FIG.

By the way, in the case of this embodiment, by using the control device 2, the time point at which feeding of the filler wire 8 starts and the time point at which feeding stops is delayed with respect to the pulse current. That is, as shown in FIG. 3, the feeding start point Pt of the filler wire 8 is delayed by a time T from the pulse current rising point P8, and the feeding stop point Pt of the filler wire 8 is delayed from the pulse current rising point P8. It is delayed by time T8 from the current falling point P#. Note that such a delay is performed for each pulse of the pulse current.

Also, the delay time? ,,? , can be arbitrarily changed (for example, from 0.03 to 0.3 seconds) by adjusting the volume 10°11 of the control device f2.

In this way, ideal welding is possible by delaying the start and stop of feeding of the filler wire 8 with respect to the rise and fall of the pulse current. That is, since the feed of the filler wire 8 is delayed by the time T1 with respect to the pulse current, the filler wire 8 is fed after obtaining sufficient penetration 12 into the workpiece 9 at the peak current a. Therefore, it is possible to perform welding in which the penetration depth 12 is deep. In addition, the filler wire 8 has a time T with respect to the pulse current.
Since the stop is delayed by t, the filler wire 8 is fed in even after the base current becomes lower than the peak current a, so that a sufficient buildup 13 can be obtained.

The depth of the welding 12 and the size of the bulge 13 are determined by adjusting the volume 10 and 11 of the control device 2 to determine the delay time.
,,? , can be changed arbitrarily by changing .

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment described above, and various modifications can be made based on the technical idea of the present invention.

For example, in the above-mentioned embodiments, the delay is carried out at both the start and stop points of feeding the filler wire 8, but the delay may be delayed depending on the material of the material to be welded 9, its use, etc. The delay operation as described above may be performed at either one of the points.

e. Effects of the Invention As described above, the present invention is configured to delay the feeding and stop of the filler wire relative to the pulse current (welding current), or to delay either one of them. Therefore, it is possible to perform welding with deep penetration by delaying the feed, or welding with sufficient buildup by delaying the stop, and if these are performed together, it is possible to perform good welding with deep penetration and sufficient buildup. Furthermore, by changing the length of the delay, it is possible to perform welding with arbitrarily selected depth of penetration and size of bulge.

[Brief explanation of the drawing]

FIGS. 1 to 3 are for explaining one embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of an automatic TIG welding apparatus that implements the pulse TIG welding method according to the present invention, and FIG. The figure is a sectional view showing the welding state of the welded material, Figure 3 (A),
(B) is an explanatory diagram showing the timing between the pulse current (welding current) and the start and stop of feed of the filler wire. Figures 4 (A) and (B) show the conventional pulse TIG welding method. FIG. 3 is an explanatory diagram similar to FIGS. 3(A) and 3(B) shown in FIG. DESCRIPTION OF SYMBOLS 1... TIG welding machine, 2... Control device, 3... Filler wire feeding device, 4... Torch,
8... Filler wire, 9... Material to be welded, 10.11... Volume, 12...
Including melting, 13... servings. Patent Applicant Suzuki Motor Co., Ltd. Agent Patent Attorney Hisao Okuyama (and 2 others) Figure 3 Figure 4 Procedural Amendment (own ship April 1, 1988, 1988 Patent Application No. 29239 2, Name of the invention Pulse TIG welding method name (208) Suzuki Motor Co., Ltd. 4, Agent 107 Address 3-2-3 Akasaka, Minato-ku, Tokyo Contents of amendment +11 Specification page 2 No. 3 Delete "Intermittently at every predetermined time interval 1" in line ~4. (2) Delete "feeding is stopped and moved..." in lines 3 to 5 on page 5 of the statement. " is corrected to "The feeding is stopped and the torch 4 and guide tip 5 are continuously moved along the welding location of the welded material 9."

Claims (1)

[Claims] In a pulse TIG welding method in which a filler wire is intermittently fed to a welding location of a workpiece and a pulsed current is supplied to an electrode of a torch to perform welding, the feeding of the filler wire is started. A pulse characterized in that at least one of an operation of delaying the rise of the pulse current and an operation of delaying the stop of feeding of the filler wire from the fall of the pulse current is performed. TIG welding method.