AWS A5.9 ER309L Stainless Welding Wire for Dissimilar Joints Shaanxi Shangyou Stainless Steel Co., Ltd. supplies aws a5.9 er309l stainless welding wire for dissimilar joints for buyers whose primary search intent is dissimilar stainless-to-carbon-steel and buffer-layer welding, not generic stainless or nickel-alloy stock. The page should be quoted against the selected standard edition, the equipment or component drawing and the governing design code. ER309L bare stainless