Q: copper pipe (diameter 8mm) and stainless steel pipe shall be welded together (80mm diameter), and copper pipe shall be welded on stainless steel pipe wall. What method can I use to ensure the welding quality.
A: 1. Use silver solder. Argon arc welding is faster and has a good appearance. During operation, the copper pipe should be heated first, and the temperature reaches the silver solder to stick, and then the welding gun is placed to stainless steel. Copper has a long stay time, and stainless steel stays short and just goes by quickly.
2. The best way is to braze. Add silver electrode. The effect of welding. Make sure you are satisfied. Find a processing place to know
The main difficulty in welding steel with copper and copper alloy is that cracks are easily produced in the weld and fusion zone. The practice shows that in order to ensure the weld has high crack resistance, the quality fraction of iron in the weld is 10% - 43%.
(1) when welding methods and welding materials of low carbon steel and copper and copper alloy, manual arc welding, submerged arc welding and tungsten argon arc welding can be adopted respectively. When welding low carbon steel and pure copper, pure copper is used as filler metal material, such as welding rod TCU (T107); QSi3-1 wire is adopted in tungsten arc welding. When welding low carbon steel with silicon bronze and aluminum bronze, aluminum bronze can be used as filler metal. When stainless steel is welded with copper, nickel or nickel base alloy is used as filler metal.
The melting point of copper is 1083.4 degrees, and that of iron is 1534.8 degrees. The melting point of stainless steel is 1500 ℃ - 1600 ℃,
Copper and iron can be welded, in many ways 1. Copper wire, MIG welding; 2. Brazing; 3. Friction welding depends on the specific workpiece.
The general method is flame brazing, copper wire and borax flux can be used
Argon arc welding is filled with special welding wire. 130 welding wire and flame gas welding can be adopted for gas welding. At 900 ℃, thin layer flow is very excellent. Manual arc can be welded with ordinary DC welding machine with M210. Because M210 is used to support the welding of all copper, copper alloy and above metals and steel, cast iron and stainless steel.
If it is small or thin parts, it can be solved by low temperature brazing
But there are also problems to consider.
The composition of the first copper and the impurities of iron are very acoustic welding. The second is used after welding. If the welding is in contact with dielectric chemistry, iron will be more active than copper, and it will cause very serious electrochemical corrosion, which greatly shortens the life of iron.
