Carbon Equivalent Fundamentals in Evaluating the Weldability of Microalloy and Low Alloy Steels

摘要

Understanding the weldability of steel in relation to the use of carbon equivalent is very necessary? for ?the welding industry. The study was poised to unearth the fundamentals of carbon equivalent as applied in evaluating the weldability of steel. The study used? a? two-stage design approach to address the problem of carbon equivalence weldability of steel, thus, survey and experimental. Two different steels were tested to ascertain their chemical composition which could inform carbon equivalent calculation, and the results revealed microalloy and low alloy steels respectively. In subjecting the microalloy steel to carbon equivalent analyses of the AWS and IIW coefficients; revealed a value (CEV) = 0.11 each, suggesting that this microalloy steel has excellent weldability; no preheat ing ?is required. A successful welding operation on this steel does not depend on preheat ing .? Also , ?the average results of the low alloy steel revealed a value (CEV) = 0.37 and 0.32 respectively, suggesting that this type of steel has very good weldability and may require? to? preheat. It is recommended that welders have? a? general idea about the weldability of steel with regard to carbon equivalent calculation. In addition , ?they should understand the chemical compositions of steels they are dealing with.