I’d like to ask the experts: is there any connection between the droplet transfer mode in welding and the mechanical properties of the weld metal?
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Recently, a master I know asked a question: why is CO2 gas shielded welding generally not used for welding important steel structures? After some thought, I believe it may be related to the excessive short-circuiting during the droplet transfer process. Could excessive short-circuiting lead to larger grain sizes and reduced toughness in the weld? I would like to ask everyone further – is there any relationship between the droplet transfer pattern and the mechanical properties of the weld metal?
The main issue with CO2 gas shielded welding is the low qualification rate for flaw detection. High requirements are placed on the grinding of the base material during welding, as well as on weather conditions; the purity of CO2 gas also plays a significant role. There’s no need to talk about the welding wire
CO2 ionization leads to the formation of refractory oxides with metals, which affects the strength of the weld; in addition, CO2 can easily cause pores and slag inclusions