Sacrificial electrode type arc welding method

Abstract

The invention provides a sacrificial electrode type arc welding method. The sacrificial electrode type arc welding method of carbon dioxide shielding gas comprises the steps of performing arc welding by using the short circuiting transfer feature of a constant voltage after the electric arc is started; raising the welding current to a current range (240-350A) of a globule transfer way and then performing arc welding by means of the constant voltage feature; converting the welding current to a pulse current in a state when a melting tank is formed and performing arc welding in a globule transfer way; wherein, in the second step and the third step, welding wires are fed to the globule transfer area in a main-welding feeding speed. In this way, during the electric arc starting period, electric arc interruption and fusion welding of the contact welding nozzle and the welding wires can be prevented and the electric arc can be made stable as soon as possible. Furthermore, a suitable bead shape and a suitable fusion depth can be rapidly obtained.

Description

technical field [0001] The present invention relates to a consumable-electrode arc welding method for welding with a pulsed arc using carbon dioxide, and more particularly to a consumable-electrode arc welding method for achieving arc stability at the start of an arc. Background technique [0002] Conventionally, in the consumable electrode type arc welding method, arc welding is performed by applying pulse welding current under the same pulse conditions as main welding from the start of welding. That is, the pulse conditions at the start of the arc are the same as those for the main welding. [0003] In this way, if the current is applied under the same pulse conditions as the main welding at the start of the arc, the arc at the start of the arc will be unstable, and irregular short circuits may occur. Therefore, there is a problem that arc interruption (temporary stop of arc) and the like occur as sputtering increases. [0004] Therefore, in Japanese Patent Application L...

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that arc interruption (temporary cessation of arc) and the like occur as sputtering increases.

In this way, the period between the first step and the second step is a section in which the formation and penetration of deposited metal by the arc cannot be expected. Therefore, it is difficult to ensure the stability of the starting part at the weld seam where the starting part becomes a part of the main welding. The problem

Images