Welding of copper and copper alloys mig welding wire
1. What is the pure copper (copper)?
A: The copper material with copper content ≥99.9% is called pure copper (copper).
Grades: C10200, C11000, C12000, C12200, etc.
Welding wire number: HS201
2. What is the copper alloy? How are they classified?
A: Adding zinc (brass), nickel (nickel), silicon (silicon bronze), aluminum to copper
(aluminum bronze), tin (tin bronze), phosphorus (phosphor bronze), and the like are called copper alloys. classification
<1> Phosphor Bronze (C50500) Welding Wire: HS202
<2> Silicon Bronze (C65100) Welding Wire: HS211
<3> Aluminum Bronze (C61300) Welding Wire: HS214
<4> Brass (C21000) Welding Wire: HS221
<5>Brown copper (C70600)
3. Why the MIG welding copper (copper) need to be preheat 400--600 °C before welding?
A: The high thermal conductivity of copper (7 to 11 times larger than steel) makes it difficult for the base metal and filler metal.
In the fusion, there is a phenomenon that the welding cannot be performed and the welding is not performed. Preheating before welding 400~600°C
Make the workpiece get enough heat to ensure the good shape of the weld to achieve normal welding.
4. Why is the pure copper weld prone to the hot cracks?
A: Sulfur, phosphorus, tin, zinc and other low-melting eutectics make copper and copper alloys have obvious heat Brittleness, weld joints are prone to hot cracks. And the tendency of weld vent holes is stronger than steel Heavy and more.
5. What is MIG brazing welding?
A: The use of low-melting copper-based solder wire solder (such as: silicon bronze, aluminum bronze, etc.)
Pure argon protected gas metal arc welding - called MIG brazing. With wire melting
Fast, arc stability, shallow penetration, fast welding speed and other process features. Control welding
Heat input is lowest, base metal does not melt; wire rapidly melts and penetrates into weld gap
, forming a brazed joint. High weld strength, small workpiece heat affected zone, thin sheet after weldingDeformation. Suitable for welded body plate butt joints, lap joints with plate thickness δ=0.8~2 mm Joints and spot welds are widely used for the welding of automobile bodies and plated steel plates.