The role of shielded gas in welding of low-carbon low-alloyed steels

The role of shielded gas In electric arc welding of lowcarbon low alloyed steels is analyzed. Special interest is paid to shielding gas oxygen equivalent, which shows a comparative influence of gas mixtures composition, and the conditions of acicular ferrite appearance. Results of weld metal toughness testing as a function of shielding gas oxygen equivalent are presented.