Automatic Welding, 2021, №11



2021 №11 (06)

DOI of Article 10.37434/as2021.11.07

2021 №11 (08)

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Avtomaticheskaya Svarka (Automatic Welding), #11, 2021, pp. 40-43

Requirements to technical characteristics of resistance

Yu.M. Lankin

.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

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 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 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 stabilize the welded joint quality, the welding current should increase smoothly at microwelding. 12 Ref., 2 Tabl.
Keywords: resistance microwelding, similarity theory, thermal inertia, welding current frequency, typical welding modes


Received: 01.09.2021

References

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