The weldability of Grade 80 and Grade 100 structural steel was examined. Welding tests were conducted to examine the effects of Gas Tungsten Arc Welding, Shielded Metal Arc Welding, and Gas Metal Arc Welding on both of the materials. Weldability was assessed in terms of resulting microstructures, mechanical properties and susceptibility to cold cracking. The tests conducted in the study show that both materials exhibit good weldability. An increase in susceptibility to hydrogen assisted cold cracking was seen in the Grade 100 steel as compared with the Grade 80 material. Both steels demonstrated sensitivity to high heat input welding, with a decrease in yield strength observed. Both materials were successfully welded without the use of preheating while maintaining the required mechanical properties.
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