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日本日立公司设计的窄间隙MIG焊设备,配有脉冲电源弯丝机构和一组辅助气体喷嘴(见下图)。这种设备所焊焊道呈半圆凹面,因而能避免用常规气体保护电弧焊焊接厚截面所遇到的咬边和未焊透等缺陷。通过一个左右弯曲焊丝的摇摆板将焊丝经导管入间隙,焊丝离开喷嘴时是摇摆的,使电弧亦摇摆,从而均匀熔化两边壁母材。通过焊丝导管前后的保护气体喷嘴,以一定压力将保
Narrow gap MIG welding equipment designed by Hitachi, Japan, equipped with pulse power wire bending mechanism and a set of auxiliary gas nozzles (see below). The weld bead is a semicircular concave surface, which avoids defects such as undercut and incomplete penetration encountered with conventional gas shielded arc welding of thick sections. The wire is guided into the gap through a wobble plate around the bent wire, the wire is rocked as it leaves the nozzle, and the arc is also rocked to evenly melt the base metal of the two side walls. Protective gas nozzle before and after the wire catheter to a certain pressure will be Paul