On the Studies of Underwater Fire Cracker Welding (2nd Report)

Fillet welding

Abstract

Authors have been studied underwater fire cracker welding which is one of the improving method for welds in underwater. As the result of applying it to fillet joint, following conclusions were obtained.
1) Excellent welds without cracks and blowholes were obtained both method by single coated electrode and by twin coated electrode.
2) In the case of welding used with twin coated electrode, bared rod was set in the corner of the fillet, because of prevention from the intrusion of water into there, and so successfull fillet weld was obtained by using parallel arc method, however, series arc method was used, only in the case of arc starting.
3) The range of proper welding conditions became comparatively widely.
4) The long size stick coated electrode could be used in underwater because of cooling effect.
5) Good welds could be obtained under sea water as well as in air atmosphere.