Studies on Hot-Start (Report 1)

Abstract

Basic experiments are carried out on the arc striking, arc reignition and flux melting phenomena of the low-hydrogen type electrodes. It has been confirmed that two defects of this kind electrodes, i. e., difficulty in arc striking end generation of blow holes at the start of weld, are eliminated by "hot-start, " an extra boost of welding current at the arc starting. A hot-start circuit without relays is achieved by using saturable reactors. Some experiments on blow holes are also given.