Aiming at the corrosion of the heat-affected zone（HAZ） of the weld of stainless steel close packed pipe joint

the test pieces are prepared with the same base metal

welding structure and welding procedure and are removed the oxide layer generated in the welding process by different surface treatment methods

and the simulated corrosion test is carried out to compare and observe the surface corrosion resistance status of the material surface after removing the oxide layer. The reason of rust in the heat-affected zone of the weld is determined by intergranular corrosion test

electrolytic corrosion test and metallographic microscope observation

and on this basis

the solution is put forward combining with the verification test.