Arc striking control method for gas metal arc welding and welding machine therefor

Abstract

The invention discloses an arc striking control method for gas metal arc welding. A welding machine for implementing the arc striking control method comprises a control unit, a welding switch, a judging unit, a storage unit and a wire feeding motor, wherein the control unit controls a rotation speed of the wire feeding motor. The arc striking control method is characterized by comprising the following steps that: when the welding switch is turned on, the judging unit acquires welding stop time duration T1 before the welding switch is turned on, judges whether the time duration T1 is greater than a welding stop time limit L1 which is pre-stored in the storage unit, and transmits a judging result to the control unit; the control unit controls the welding machine to perform a first arc striking mode operation if the time duration T1 is less than or equal to the time limit L1; and the control unit controls the welding machine to perform a second arc striking mode operation which is different from the first arc striking mode operation if the time duration T1 is greater than the time limit L1.

Description

technical field [0001] The invention relates to the arc-starting control technology of arc welding, in particular to the arc-starting control technology of melting electrode gas shielded arc welding. Background technique [0002] At present, the commonly used arc ignition control methods for MIGA welding are, for example, Figure 5 As shown, the slow wire feeding method is adopted at the beginning of arc ignition, that is, the wire feeding speed is lower than the standard wire feeding speed during welding, and the wire feeding speed is increased to the standard wire feeding speed after the arc is ignited, so that To achieve smooth arc start. However, this arc striking control method has the following problems: [0003] 1) The same arc ignition control method is adopted for each arc ignition, regardless of the length of welding stop before arc ignition. In fact, for the case where the welding stop time before arc ignition is relatively short (for example, short-term arc int...

AI Technical Summary

Problems solved by technology

This type of welding requires fast arc ignition, and a long arc ignition time will lengthen the welding time each time, resulting in a decrease in welding efficiency; or shorten the actual welding time each time, resulting in unqualified welding quality

[0004] 2) The slow wire feeding method has been adopted from the start of the welding switch to the ignition of the arc, which further increases the arc ignition time

[0005] 3) When the welding wire contacts the welding workpiece before the arc is started, it will cause the arc to be unsmooth, and if it is not handled properly, it will affect the welding quality

In this case, the welding wire is still fed at the standard wire feed speed after the arc is broken, and the standard wire feed speed is faster, so wire breakage will occur

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