Abstract
Austenitic stainless steels are the main material for liquid natural gas tanks. Traditional Cr-Ni steels can be replaced by cheaper C-Ni-Mn-N ones, but there are difficulties with the implementation of welding for such materials, including nitrogen loses and hot cracking. Fiber laser welding can be applied to partially solve these problems, however the process optimization is needed to provide the optimal weldpool shape. In this work it was shown that the increasing of the laser beam power leads to the appearance of the second plasma torch and the area of open surface of the weldpool on the back side increases significantly, that can influence the interaction between the melted steel and the environment.
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