Packaged, it is best to look at the standard of the welding rod. The carbon steel and stainless steel standard is not the same. Downstairs said the A102 is stainless steel electrode A at the beginning, but some stainless steel electrode is not. A merely said at the beginning of the austenitic stainless steel welding rod. Ferritic and duplex stainless steel electrode. Many E it. E2209 and E4315, a stainless steel, one is carbon steel. In addition, see the medicine skin and the color of the core wire can distinguish. Corrosion. Attrition. You can.