... work for 48hrs continuously 5,delivery fast high frequency small welding machine Product Features: 1, transistor (IGBT) high ... that the equipment 24 hours of continuous work. 3, small size, light weight, easy to move, no million ... all kinds of spline shaft, drive axle, various small shaft crank pin, a variety of rocker, rocker ... , planing and other heat treatment. high frequency small welding machine