Pickling preparations for metal surfaces; soldering, brazing or welding powders and pastes consisting of metal and other materials 金属表面酸洗剂焊粉或焊膏(金属及其他材料制成的焊粉或焊膏),
Fluxes and other auxiliary preparations for soldering, brazing or welding; preparations of a kind used as cores or coatings for welding electrodes orrods 焊接用的焊剂及其他辅助剂等(包括作焊条芯子或焊条涂料用的制品),