Procedure

Welding done on continuously moving roller at
4 to 6 rpm with semiautomatic welding of 1000
A machine wire feeder.
Parameters Used: Position: Vertical down
Current: 400-450 A
Voltage: 28-32 V
Stickout length: 30-40 mm
Roller speed: 4-6 rpm

It involves ‘arcing’ with a 2.8 mm Lotherme-OA-653 wire. This special, large diameter cored wire operates in the spray arc mode at relatively medium currents depositing high amounts of weld metal droplets of a uniform size as shown in figure. It is used with a relatively long stick-out length and produces a very powerful arc, which enables the welding of the rolls while rotating.