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Single pass welds have been made on a newly developed high carbon bainitic steel with the process of A-Tig welding. Despite the high carbon content, welding could be performed without the requirement of preheating, as a fully carbide free bainitic microstructure forms within the weld from the initially spheroidized condition. Therefore the welds are not susceptible to cold cracking upon cooling to room temperature. The single pass welds were performed by varying the heat input through changes in the welding speed, all the welds produced show a greatly uniform hardness of about 640HV1. This strongly suggests that the precipitates required for bainite formation in the new steel grade are only slightly influenced by the spheroidization annealing.

Optimization of Single Pass Welding of High Carbon Bainitic Steel