Multi-Functions Hand Shower,Hand Shower Mixer,Hand Shower Mixer Set,Round Hand Shower ASHOWER , https://www.ashower.com
The method of welding copper (commonly referred to as industrial pure copper) includes gas welding, manual carbon arc welding, manual arc welding, and manual argon arc welding. Large-scale structures can also be automatically welded.
1. The most commonly used red copper welding copper welding butt joints, lap joints and T-joints as little as possible. Gas welding can use two types of welding wire, one is a wire containing deoxidizing elements, such as wire 201, 202; the other is a general copper wire and the cut of parent material, using air agent 301 as a flux. Nitrogen flame should be used when welding copper.
2. The manual arc welding of copper uses copper electrode copper 107 in the manual arc welding and the copper core (T2, T3). The edge of the weld should be cleaned before welding. When the thickness of the weldment is more than 4 mm, it must be preheated before welding. The preheating temperature is generally around 400-500°C. Welding with copper 107 electrode, the power should be DC reverse connection.
Short arcs should be used for welding and the electrodes should not be oscillated laterally. The reciprocating linear movement of the welding rod can improve the formation of the weld seam. Long welds should be gradually back welded. The welding speed should be as fast as possible. In multilayer welding, the slag between layers must be completely removed.
Welding should be performed in a well-ventilated place to prevent copper poisoning. Post-weld application of a flat hammer strikes the weld to eliminate stress and improve weld quality.
3. When manual copper-arc welding of copper is performed in manual argon arc welding of copper, the wire used is wire 201 (special copper wire) and wire 202, and copper wire, such as T2, is also used.
Before welding, the oxide film, oil, and other contaminants on the welding edge of the workpiece and the surface of the wire must be cleaned to avoid defects such as blowholes and slag inclusions. Cleaning methods include mechanical cleaning and chemical cleaning.
When the butt joint plate thickness is less than 3mm, the groove is not opened; when the plate thickness is 3 to 10mm, the V groove is opened and the groove angle is 60~70?; when the plate thickness is greater than 10mm, the X groove is opened. The angle of the groove is 60~70? To avoid incomplete penetration, no blunt edge is usually left. According to the plate thickness and groove size, the installation gap of the butt joint is selected within the range of 0.5 to 1.5 mm.
Copper manual argon arc welding, usually using direct current connection, that is, the tungsten electrode is connected to the negative electrode. In order to eliminate air holes and ensure reliable fusion and penetration of the root of the weld, it is necessary to increase the welding speed, reduce the consumption of argon gas, and preheat the weldment. When the thickness is less than 3mm, the preheating temperature is 150~300°C; when the thickness is more than 3mm, the preheating temperature is 350~500°C. The preheat temperature should not be too high, otherwise the mechanical properties of the welded joint will be reduced.
There are also copper carbon arc weldings. The electrode used for carbon arc welding is a carbon electrode and a graphite electrode. The copper wire used for carbon arc welding is the same as that used for gas welding. It can also be used to cut strips of parent metal. It can be used to flux the copper flux, such as 301.
Brass welding method:
Methods include: gas welding, carbon arc welding, manual arc welding and argon arc welding.
1. Brass gas welding Because of the low temperature of the gas welding flame, the evaporation of zinc in the brass during welding is less than when welding, so gas welding is the most commonly used method in brass welding.
The welding wire used in brass gas welding includes: wire 221, wire 222, and wire 224. These wires contain elements such as silicon, tin, and iron, which can prevent and reduce the evaporation and burn-in of zinc in the molten pool, and are favorable for ensuring the weld seam. Performance and prevention of blowholes. The commonly used flux for gas-welded brass is solid powder and gas flux. The gas flux consists of boric acid methyl ester and methanol. The flux is 301.
2. Brass hand-arc welding brass can be used in addition to the copper 227 and copper 237, but also can use the homemade electrode.
In the case of brass arc welding, a direct current power supply connection method should be adopted, and the welding rod should be connected to the negative electrode. The surface of the weldment before welding should be carefully cleaned. The groove angle should not be less than 60~70 in general. In order to improve the weld formation, the weldment should be preheated by 150~250°C. The operation should use short arc welding, not horizontal and front and rear swing, only for linear movement, high welding speed. Brass weldments in contact with corrosive media such as seawater, ammonia, etc. must be annealed after welding to eliminate weld stress.
2. Brass manual argon arc welding brass manual argon arc welding can use standard brass welding wire: wire 221, wire 222, and wire 224, but also can use the same composition as the parent material for the filling material.
Welding can be connected with DC or AC. When using AC welding, the evaporation of zinc is lighter than when DC is connected. Usually do not preheat before welding, only when the difference between the thickness of the board is relatively warm. The welding speed should be as fast as possible. After welding, the weldment should be heated at 300~400°C for annealing to eliminate welding stress so as to prevent the weldment from cracking during use.
4. Brass carbon arc welding Brass carbon arc welding, according to the composition of the base metal wire 221, wire 222, wire 224 and other wire, can also be used for home-made brass wire welding. Welding can be used as a flux agent such as 301. Welding should be short-arc operated to reduce zinc evaporation and burning.
Copper welding: