Guangdong Jiasheng Alloy Materials Co., Ltd:

Welding technology and technology of brass

Source: 2023-11-16 15:54:53 
Brass is a kind of copper alloy with excellent processing properties, but also has the characteristics of strong corrosion resistance, cold and hot processing properties and excellent casting properties. It is widely used in electronic and electrical industry, chemical industry, machinery industry and many other industrial industries. The welding of brass in the process of reproduction is mainly divided into the welding of processed copper and the repair welding of castings.
The following is an introduction to processing brass welding - brass welding methods are: gas welding, carbon arc welding, manual arc welding and argon arc welding.

1, gas welding of brass: due to the low temperature of the gas welding flame, the evaporation of zinc in brass during welding is less than that when using electric welding, so in brass welding, gas welding is the most commonly used method. The welding wires used in brass gas welding are: wire 221, wire 222 and wire 224, etc. These wires contain silicon, tin, iron and other elements, which can prevent and reduce the evaporation and burning loss of zinc in the weld pool, which is conducive to ensuring the performance of the weld and preventing the formation of pores. The fluxes commonly used in gas welding brass are solid powder and gas auxiliaries. The gas is composed of methyl borate and methanol. Such as gas agent 301.

2, manual arc welding of brass: welding brass in addition to copper 227 and copper 237, you can also use homemade welding rods. When welding brass arc, direct current power supply should be used, and the electrode should be connected to the negative electrode. The surface of the weldment should be carefully cleaned before welding. The Angle of the groove should generally not be less than 60-70, in order to improve the weld formation, the weldment should be preheated 150-250℃. During operation, short arc welding should be used, without transverse and backward swing, and straight line movement should be required, and the welding speed should be high. Brass welds in contact with corrosive media such as seawater and ammonia must be annealed after welding to eliminate welding stress.

3, manual argon arc welding of brass: Brass manual argon arc welding can use standard brass welding wire: wire 221, wire 222 and wire 224, can also use the same composition of the base material as the filling material. Welding can be done with direct or alternating current connections. When welding with AC, zinc evaporates less than when welding with direct current. Usually, there is no need to preheat before welding, only when the plate thickness difference is relatively large. Welding speed should be as fast as possible. After welding, the welds should be heated at 300-400℃ for annealing treatment to eliminate welding stress to prevent cracks in the use of welds.

4. Brass carbon arc welding: When brass carbon arc welding, wire 221, wire 222, wire 224 and other wires are selected according to the composition of the base material, and homemade brass wire welding can also be used. Welding can use gas agent 301 and other additives. Welding should be short arc operation to reduce zinc evaporation and burning loss. Dc TIG welding process is widely used in the welding of copper and copper alloys, with good welding air forming and excellent internal and external quality. Under the protection of argon, the molten pool is pure, the porosity is less, the influence of hot cracking is less, and the operation is easy to master.

In recent years, the construction of copper and copper alloys using MIG method is more and more, especially for aluminum bronze, silicon bronze and white copper with thickness ≥3mm, MIG welding method is the best choice. Thickness 3~14mm or > 14mm copper and copper alloys are almost always selected MIG welding, because of high deposition efficiency, deep penetration, and fast welding speed (generally 3 to 4 times that of TIG welding), to achieve efficient, high-quality, low-cost economic benefits. Before welding, the copper should meet the preheating temperature requirements (400~600℃ for pure copper, 200~300℃ for copper alloy), the welding wire and the base metal are fully similar in chemistry, and the purity of argon is ≥99.98%.

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