Determination of Preheating Conditions to Avoid Weld Cracking in Steel Constructions (Report 2)

Proposal on Determination of actual preheating condition

Abstract

Control of weld cracking is one of the most important problems on welding steel constructions.
In this present report, practical use of weldment cracking parameter Pw previously proposed is undertaken for avoiding weld cracking in steel constructions. The relation of the Pw-value versus critical cooling time (tc) cr of weld is found to be applicable for weld heat input less than 30, 000 J/cm.
Preheating conditions to assure no weld cracks are proposed as a function of the Pw-value founded on previous study. And determination of preheating temperature in steel constructions from y-groove weld cracking test results is also proposed. Weld cracking tests of full size model specimen reveal above proposals being applicable successfully.