Combining test data and literature data

it is analyzed that four types of welding materials

385

316LMn

316L

and modified type 308L

can be used for welding of ultra-low temperature 304L austenitic stainless steel

and can meet the requirement of the impact energy of the weld metal at-196 ℃ ≥50 J. The welding process evaluation tests were carried out for 385

316LMn

modified type 308L electrodes and 316 L rod

each mechanical property met the requirements of the standard. Compared with the chemical composition and -196 ℃ impact test data of the weld

it was proved that with the increase of the content of ferrite in the weld

the impact value was obviously reduced

and the ultra-low temperature toughness of GTAW was better than SMAW. By controlling the number of ferrites of the four types of welding materials within 2 FN

the impact energy of the weld metal at -196 ° C can be greater than 50 J.