Pre-welding: 4mm thickness of about not break open, direct solder, a single penetration. 4 to 6 mm thickness of butt weld joints can be no open break-sided Welding Electrode. 6 mm or more, generally open V or U, X-shaped groove. Second: welded parts, filler wire for degreasing and descaling. To ensure the welding quality. Welding parameters include: welding current, tungsten diameter, arc length, arc voltage, welding speed, protect air, the nozzle diameter. 1, weld welding current is a key factor in the decision. Usually based on weldment material, thickness, and the groove shape to decide. 2, welding pole diameter welding current according to the size of the decision, the larger the current, the greater the diameter. 3, arc welding and arc movies, arc length range of about 0.5 to 3mm, the corresponding arc voltage of 8 ~ 10V. 4, welding speed: Choose to take into account the current size, sensitivity to weld pieces of material, welding position and mode of operation and other factors.
1 mechanism Spot welding system consists of mechanical devices, power supply units, control unit has three major components. Spot Welding Electrodes machine welding process in order to meet the requirements of institutional pressure (welding clamp) using a fast two-stroke pneumatic drive mechanism, through the switch stroke control lever to change the opening degree of welding pliers, can be divided into large-and small opening to meet the welding requirements. Welding clamp is usually a short trip to the state open, when the control button to switch to "power" position, pull the lever switch is welded tight clamping pressure, while the current in the control system under the control of a welding cycle to complete the short trip back to Zhang open state. 2 power supply unit The main power circuit consists of resistance welding transformers, thyristor unit, the main power switch, the welding circuit and other components. Currently, we use the welding equipment is power 200kVA, the secondary voltage of 20V single-phase output frequency AC resistance Tungsten Electrode machine. For a variety of models of production lines, welding clamp to welding high strength steel and mild steel sheet, welding gun arm clamp large mechanical force to pass and welding current, welding clamp strength, stiffness, fever, to meet certain requirements , and to have good electrical and thermal conductivity, while welding clamp requires the use of cooled by water, so I chose welding electrode clamp arm can withstand the pressure of new welding clamp 400kg. 3 control The main control unit provides control signals on and off movement of resistance welding machine welding current, welding current control, fault monitoring and treatment.