How to Weld Copper to ARCAP

ARCAP is a registered trademark for a group of alloys that do not contain iron, making the metal resistant to chemical corrosion and changes in temperature. ARCAP is commonly made from a combination of nickel, copper, cobalt, tin, lead and zinc. Copper and copper-nickel alloys are most often welded with a manual metal arc process, using a stick electrode coated with flux. Welding copper to ARCAP alloys can be accomplished with minimal difficulty.

Things You'll Need

• Metal arc welder
• Copper welding rod

Instructions

1. Employ 70-30 copper-nickel filler to the ARCAP workpiece. ARCAP may or may not contain at least 70 percent copper. Make sure you know the exact copper properties of the ARCAP workpiece prior to welding. The filler will form a stronger weld.

2. Clean the workpiece surface of any elements that can cause cracking, especially phosphorus and sulfur. This includes any packing or machining materials such as cutting fluids, grease, oil and paints.

3. Place the welding rod onto the ARCAP workpiece. Ensure that it is positioned accurately for your specific job.

4. Hold the weld head onto the rod, about 1 inch away. Weld the rod in a down-hand manner. This will allow a greater deposition rate. Work down the length of the rod until the weld is complete.

Tips & Warnings

• Weld slowly. Be precise when positioning the weld head. If the copper is welded too hot, it will melt and ruin the workpiece.

• Use extreme caution when welding.

• Always wear appropriate safety equipment when welding

References

• Cal-MSX: Arcap Alloy
• Quantum Alloys: Arcap Properties
• Brazing: Copper Welding Procedures