Magnetic blow-out processing control method for consumable-electrode type pulse arc melting

Abstract

In the consumable-electrode pulse arc welding where the energization of a peak current Ip and a base current Ib are alternately repeated, the arc break caused by the magnetic arc blow is suppressed in a short time in the following way. When an arc is generated during an energization period Tb of the base current and the rising rate Dv of a welding voltage Vw becomes a predetermined reference rising rate Dvt or more with no short circuit being generated just before the voltage Vw becomes so, a judgement (t25) that the magnetic arc blow occurs is made to rapidly increase the base current to 200 A or more. Next, when the welding voltage Vw is decreased during the period of the magnetic arc blow, a judgement (t26) that the magnetic arc blow is ceased is made to return the base current Ib+Iu to the normal value Ib.

Description

technical field [0001] The invention relates to a control method for magnetic blowing treatment that does not cause arc interruption when magnetic blowing occurs in consumable electrode type pulse arc welding. Background technique [0002] In the consumable electrode type pulse arc welding of steel, etc., the consumable electrode (welding wire) is melted, and the droplet is moved to the base metal melting pool with a large current (peak current) of about several hundred A and without using the electrode. The molten low current (basic current) of tens of amperes alternates repeatedly, flows between the electrode and the base metal, and performs welding. In pulsed arc welding, it is very important to maintain the state of transferring one droplet to one pulse and one droplet in the base metal melting pool by one peak current energization, which is very important to obtain a beautiful weld appearance with less spatter. However, in consumable electrode type pulse arc welding of...

AI Technical Summary

Problems solved by technology

However, since the melting of the tip of the wire increases by increasing the base current, it deviates from the good state of transferring one droplet per pulse

As a result, even if the interruption of the arc caused by the magnetic blow can be suppressed, the state of the arc becomes unstable and the welding quality deteriorates.

In addition, if the judgment of the occurrence of magnetic blow is delayed, even if the base current is increased, the arc interruption cannot be prevented in many cases.

[0014] ③ Identify the problem of accelerating the feeding speed after the magnetic blow occurs

Therefore, even if the feed speed is increased after the occurrence of magnetic blow is judged, it is difficult to respond in such a short time, and therefore, the arc interruption cannot be prevented in many cases.

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