Abstract
316LN stainless steel is a material with excellent mechanical properties, good resistance to intergranular corrosion and good weldability, and it has been used in many fields of industry. Welding quality has great influence on the strength and corrosion resistance of weldment. In this study, one group of submerged arc welding and three groups of shielded metal arc welding were taken to study the influence of heat input on grain size in the structure of 316LN welded joints. The results show that the microstructures of the weld zones in experiment were all consist of austenite and a small amount of banding or dendritic δ-ferrite and the amount of ferrite decrease with the increase of heat input. It also can be concluded from the experiment that with the increase of welding heat input the grain size of overheated zone decrease.
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