1 copper has excellent electrical conductivity, thermal conductivity, corrosion resistance, ductility and strength of certain other features. In electrical, electronic, chemical, food, power, transportation and aerospace industry has been widely used. In the copper (copper powder(FCu)) to add more than 10 kinds of alloying elements to form a solid solution of various types of copper alloys, such as zinc for brass; nickel plus copper-nickel alloy; plus silicon-silicon bronze; Alcan aluminum bronze, and so on.

(2) Copper and copper alloys can be brazed, resistance welding and other craft methods to connect, in the industrial era, welding has been dominant. Arc welding with electrodes, TIG welding, MIG welding process methods such as easy to implement copper and copper alloy welding.

3 effects of copper and copper alloy welding process has four main elements of difficulty: First, the impact of high thermal conductivity. Thermal conductivity than copper, carbon steel heat 7 to 11 times larger, silicon powder when used with the welding process parameters is almost the same thickness of steel, then copper is difficult to melt, filler metal and base metal can not be a good fusion. Second, the tendency of hot cracking of welded joints large. Welding, the pool of copper and impurities which form low melting point eutectic material, boron powder so that copper and copper alloy has a significant thermal brittleness, hot cracking. Third, the resulting porosity defects is much more serious than the carbon, hydrogen and if the hole. Fourth, changes in the performance of welded joints. Grain coarsening, the plastic down, fall in corrosion resistance.

4 Copper (copper) can be used "copper 107" welding welding, use Panasonic 400AT2, 400/600SS DC arc welding machine, DC reverse. Before welding, preheat the workpiece to be 400-600 ℃, ensure welding filler metal and base metal fusion sound. Silicon bronze, aluminum bronze, phosphor bronze welding the welding process can also be used the same chemical composition of the copper alloy structure.

5 DC TIG welding method is widely used in copper and copper alloy welding, metal powder supplier welding forming a good style, good quality both inside and outside, under the protection of argon gas, pool clean, pores small, thermal cracking little effect, the operation easy to master. ≤ 4mm thickness can be welded without preheating, the direct use of argon gas preheating, bath temperature to be close to 600 ℃, it can add filler wire melting the base material, to achieve welding. Thickness greater than 4mm of copper, copper should be preheated 400-600 ℃. Copper alloy welding preheat 200-300 ℃. 300TSP, 315TX DC TIG welder can weld copper, silicon bronze, phosphor bronze, brass, copper-nickel alloy and other copper alloys. 300WP5, 300/500WX4 AC and DC TIG welding AC TIG welding aluminum bronze can be used (with AC square wave to remove the surface oxide film) and DC TIG welding with the copper.

6 In recent years, methods using MIG welding copper and copper alloy construction more and more, manganese powder especially for thicknesses ≥ 3mm aluminum bronze, silicon bronze, and copper-nickel alloy the best selection of MIG welding method. Thickness 3 ~ 14mm or> 14mm copper and copper alloy MIG welding is almost always used as a high deposition efficiency, deep penetration, faster welding speed (TIG welding is generally 3 to 4 times), to achieve high efficiency, high-quality, low- the economic benefits of cost requirements. nickel powder Copper preheating before welding shall meet the temperature requirements (copper 400 ~ 600 ℃, copper alloy 200 ~ 300 ℃), wire and base metal chemistry sufficiently similar, argon purity ≥ 99.98%. Tangshan Matsushita 500RF2 waveform control, 500AG2 inverter pulsed MIG / MAG welding machine for the melting of copper and copper alloy gas shielded arc welding process requires. Source:www.mhcmp.com