Effect of welding parameters on hot cracking susceptibility of alloy 800

Abstract

The varestraint cracking test was carried out to assess the hot cracking tendency of alloy 800 at different welding conditions and augmented strain levels. The test results revealed that the hot cracking susceptibility of alloy 800 increases with increasing the heat input and augmented strain levels. This emphasizes the role of constraint either internally induced or externally applied to the welded structure. A cracking threshold or the minimum augmented strain (∈min) below which no hot cracking takes place has been found to be 0.25 for alloy 800. Also, the Critical Strain Rate to Time (CSS) required to cause cracking was found to be 6.42×10-3 sec-1 at welding condition of 100 Amp, 13 Volt and 140 mm/min. © 1994, JAPAN WELDING SOCIETY. All rights reserved.