Effect of welding wire compositions on welding process stability and droplet transfer behavior of high nitrogen stainless steel GMAW

In order to analyze the stability of the special welding wires for high nitrogen stainless steel, high-speed camera was used to track the droplet transfer morphology and analyzer of Hannover was used to evaluate the droplet transfer. The results show that although weld spatter produced along with the increase of nitrogen content, the stability of the droplet transfer and the signals of currents and voltages are improved. This is because to make deposited metal astenitized, the Ni content was reduced while the Mn content was increased with increasing nitrogen content, so that surface tension of the material was improved. And the adjustment of elements reduces the critical current of spray transfer so that the spray transfer is more likely to happen.