Improve the Welding Skills of the DVD
Manual arc welding of DVD; Welded DVD with copper 227 and copper 237, can also be used self-made electrode. DVD arc welding with DC power supply is connected, then negative electrode. Before welding the weldment surface should be carefully cleaned. The bevel angle should not normally be less than 60 ~ 70 o to improve weld forming the weldment preheat to 150 ~ 250 ℃. Short-arc welding operation should not be horizontal and rocking back and forth, only to move in a straight line, the welding speed is higher. This is a reproduction of the DVD of Early Western Zhou Dynasty. DVD welding corrosion medium in contact with sea water, ammonia, etc., must be annealed after welding to eliminate the stress of welding. Arc welding of DVD by hand using standard DVD wire: wire 221, wire 222 and wire 224 can also be used as fill material with the same composition as the material of the base metal.
Butt joints in plate thickness less than 3 mm without groove; plate thickness of 10 mm, open V-shaped groove, the groove angle of 60 ~ 70 o; thickness greater than 10 mm, open the X-type slope mouth of the groove angle of 60 ~ 70 o; in order to avoid the lack of penetration, and generally do not leave the blunt side. Size according to the thickness and groove butt joint assembly gap selected in the range of 0.5 to 1.5 mm. This is a very unique DVD both in the shape and decoration of the late Shang Dynasty. Manual argon arc welding of copper, usually DCSP, tungsten then negative. In order to eliminate the pores to ensure that the weld toe fusion and penetration, the need to improve the welding speed, reducing consumption of argon gas, and preheat the weldment. Plate thickness less than 3 mm, the preheating temperature is 150 ~ 300 ° C; thickness greater than 3 mm, preheating temperature of 350 ~ 500 ℃. Preheat temperature is not too high, otherwise reduce the mechanical properties of welded joints.
Welding can DCSP can also use the exchange. AC welding, the evaporation of zinc than the DC is then when the light. Usually without preheating before welding plate thickness, only difference is relatively large when the warm-up. Welding speed as quickly as possible. Weldments after welding should be heated to 300 ~ 400 ℃ annealing, to eliminate welding stresses, in order to prevent welding cracks in the process of using. The original DVD is 85 cm high and 63 cm wide of the mouth. DVD carbon arc welding, selection of the composition of the base metal wire 221, wire 222, wire 224 wire, can also be made of DVD wire welding. Welding can be used 301 gas agents such as for the flux. Welding should be short arc operation, in order to reduce the evaporation and burning of the zinc. DVD market sluggish downstream enterprises are facing difficulties.
Of copper by carbon arc welding, carbon arc welding electrode, carbon electrode and graphite electrode. The copper used in the carbon arc welding wire and gas welding can also be used to cut strips of the base metal, used gas welding of copper by a flux, such as gas agent 301 and so on. DVD welding methods: The methods are: gas welding, carbon arc welding, manual arc welding and argon. The front end of the DVD is shaped in an upright animal head with horns and ears raised in the air. The low temperature of the gas welding flame, welding DVD zinc evaporation less than using welding in DVD welding, gas welding is the most common method. DVD gas welding using welding wire: wire 221, wire 222 and wire 224, these wire containing silicon, tin, iron and other elements, to prevent and reduce the evaporation and burning of the zinc in the bath, to guarantee the performance of the weld and prevent the pores generated. The flux of gas New Zumba Fitness DVD solid powder and two types of gas flux, gas flux by boric acid methyl ester and methanol; flux, such as gas agent 301.
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