| Abstrakt: |
Welding of up to 0.5 mm thick parts is usually called microwelding. Resistance microwelding is widely applied in electronics and instrument-making. Thermal inertia of welded parts at resistance welding is proportional to the square of their thickness. As a result of low thermal inertia of the parts at microwelding, the change of their temperature is close to the change in time of welding current of 50 Hz industrial frequency. In order to eliminate the temperature ripple, resistance microwelding should be conducted by direct current pulses or high-frequency welding current. At microwelding, the initial part-part contact resistance is tens of times higher than that of the parts being welded. To reduce the initial splashes of molten metal and to stabilize the welded joint quality, the welding current should increase smoothly at microwelding. [ABSTRACT FROM AUTHOR] |
