CHANGZHOU WANYUAN MACHINERY WEIDING MATERIALS ARE: CO2 GAS-SHIELDED WELDING WIRE, ACCORDING WITH GB-ER50-6/AWS ER70S-6/EN-440/JIS ***** PRODUCT ADOPTS ADVANGCED COPPERIZING TECHNIQUE , SUFACE OF WIRES IS SMORHING AND FLAT, COPPER LAYER EVEN FIRM ADOPTION CIS ADOPETED STABLE ARC, LESS ...