JPS5950968A - Arc welding method - Google Patents

Abstract

PURPOSE:To form beads having an allowance for the deviation in aiming a weld line and to obtain required weld strength, by feeding simultaneously plural welding wires into the plural welding wire passage holes provided to a contact chip. CONSTITUTION:Two welding wire passage holes 2 are punched to a contact chip 1, and welding wires 3 are respectively fed therein. Electricity is conducted to the chip 1 and the work 4 to generate a welding arc 5, by which a welding section 6 is welded. Beads 9, 10 are built up in one body by the welding arcs of the two wires 3 so that the allowance for the deviation in aiming the weld line 8 is considerably increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an improvement in a consumable polar arc welding method.

In general, the consumable electrode arc welding method is a method in which a welding wire is fed to the workpiece, and electricity is passed between the wire and the workpiece to generate a welding arc and melt the workpiece. Welding wire 75! If it is bent or the precision of the object to be bathed, the jig, etc. is poor, the welding location will not be melted and the welding will be performed at a shifted location. For this reason, there have been problems such as not being able to obtain the required welding strength or not being able to achieve airtightness. In addition, the cross-sectional shape of the weld bead formed by the consumable electrode arc welding method is almost fixed for each welding method. For example, a wine cup-shaped weld bead cross-section has no margin for bath tangent deviation. ,
Even if we wanted to create a cross-sectional shape of the weld bead with no shape, we were unable to obtain that shape.

The purpose of the present invention was made in view of the above-mentioned 7 problems,
To provide an arc welding method in which a wide weld bead can be formed by simultaneously feeding a plurality of welding wires, and the weld bead can be formed with a margin for welding line alignment.

In order to achieve such an object, the method of the present invention provides a contact tip with a plurality of welding wire passage holes, feeds a welding wire to each of the passage holes, and applies electricity between the contact tip and the workpiece. By flowing, a welding arc is generated and the area to be welded is fused and welded.

Hereinafter, details of the method of the present invention will be explained using examples shown in the drawings.

FIG. 1 is an explanatory diagram for explaining the arc welding method according to the present invention, and FIG. WJ2 is an enlarged plan view of the contact tip viewed from one side. As shown in FIG. 2, two welding wire passage holes 2 are bored in the contact tip 1, and welding wires 3 are fed into each of the passage holes 2. By passing electricity through the contact tip 1 and the workpiece 4, the welding arc 5 is started, and the entire part 6 to be welded is fusion welded. The example in FIG. 1 shows the case of a butt joint.

Note that conventionally, a contact tip has only one welding wire passage hole, and the welding wire is fed to the passage hole to perform arc welding.

In the conventional arc bath welding method, the cross-sectional shape of one weld bead 7 is formed as shown in FIG. The depth of penetration was drastically reduced and the strength was poor, but
As shown in this embodiment, if two welding wires 3 are fed, beads 9.10 are synthesized by the welding arc from the two welding wires 3, as shown in FIG. The allowable amount of misalignment of the weld line 8 will be dramatically expanded. The welding wire passing holes 2 are installed perpendicularly to the welding line 8 as shown in FIG. 1, and the distance t between the welding wire passing holes 2 is 0.5 rt.
A value between a and 10 is desirable. Moreover, it goes without saying that the number of the welding wire passage holes 2 may be two or more.

As explained above, according to the uninvented arc welding method, by feeding a plurality of welding wires at the same time, it becomes possible to obtain an arbitrary weld penetration shape, and it is possible to obtain a welding shape with a wide weld bead formed entirely. This has an excellent effect in that a weld bead can be formed with a margin for welding line misalignment.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram for explaining the arc welding method f according to the present invention, Fig. 2 is an enlarged plan view of the contact tip when viewed from below, and Fig. 3 is a weld bead formed by the conventional arc welding method. FIG. 4 is a diagram showing the cross-sectional shape of a weld bead formed by the method of the present invention. ■... Contact tip, 2... Welding wire passing hole, 3... Welding wire, 4... Work to be welded, 5... Welding arc, 6... Portion to be welded. Agent Tatsuyuki Unuma (and 2 others) 1st figure 2 figure 3 figure 4

Claims (1)

[Claims] [Contact]-A welding arc is generated by providing a plurality of welding wire passing holes in the tip, feeding welding wires to each of the passing holes, and passing electricity between the contact tip and the workpiece to be welded. An arc welding method characterized by bath fusion welding.