FOR GMAW, JOINING AND OVER BY APPLICATION.
GM 7200, ERCu
AWS/SFA 5.7: ER Cu
• Copper alloy for welding deoxidized copper.
• The molten pool is clean.
• The deposit is tough and free from porosity.
ALLOY BASE : Cu, Ag, p
CHEMICAL ANALYSIS (RANGE) %
MECHANICAL PROPERTIES (RANGE)
Acetylene torch, Neutral flame. TIG/MIG processes.
Prepare V-groove of about 600 where thickness is more than 5mm. Clean the joint thoroughly. Apply flux on the joint area. Use neutral flame. Preheat a broad area, then heat locally until flux melts. Apply the flux to the rod by dipping heated end into the flux and melt the rod in to the joint.
Remove flux residues mechanically or chemically (using 10% sulphuric acid) followed by rinsing in running water.
SHIELDING GAS : Welding grade Argon OR 80% Argon + 20% Helium