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A study has been made of the influence of techniques for testing and measuring welding current and weld size on weldability data, in the case of resistance spot welding of 1.1mm thick low carbon steel. Procedures have been set up for carrying out weldability tests to facilitate comparison of welding equipment. These have included the use of repeat weld growth curves, using new electrodes in an effort to accommodate within-machine variation. Electrical and mechanical characteristics of eight resistance welding machines, including portable gun and pedestal types, have been defined. The influence of those characteristics on weldability has then been studied. The most significant effect was that of welding power supply type, with dc current producing a larger welding range and less scatter than ac. Low phase shift settings produced slightly poorer results compared to full conduction conditions. Despite substantial differences in mechanical characteristics of the equipment studied, no clear, consistent influence could be identified between those factors and weldability.

Additional information

Authors: WESTGATE S A, The Welding Institute, Abington Hall, Abington, Cambridge CB1 6AL (GB)
Bibliographic Reference: EUR 12139 EN (1989) MF, 93 pp., ECU 4, blow-up copy ECU 12.50
Availability: (2)
Record Number: 198911182 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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