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Development of Short Pitch Resistance Spot Welding Technology

Article of Honda R&D Technical Review Vol.25 No.2

Summary

In order to reduce the pitch used in resistance spot welding, it is necessary to quantify the phenomenon of shunting, or short-circuiting of current flow. A technology for predicting the state of current flow using a three-dimensional spot welding simulation was therefore developed. Test results showed that predicted spot weld diameter values when current shunting occurred, corresponded well with measured values. Using this method, it was shown that it was possible to realize sufficiently sized spot welds in short-pitch resistance spot welding by increasing input energy to compensate for heat loss caused by the short-circuiting of the welding current. In addition, an application study of short pitch spot welding showed that a reduced weld pitch of 15 mm in high stress regions reduced peak stress in the weld, making the use of thinner steel sheets possible.

Reference

(1) Doira, K., Ohoka, H., Umeno, K., Fukumoto, M., Okamura, K., Ueda, H.: Development of Resistance Spot Welding Simulation Technology, Honda R&D Technical Review, Vol. 18, No. 1, p. 185-192
(2) Japanese Industrial Standards, JIS Z 3140:1989, Method of Inspection for Spot Weld

Author (organization or company)

Hisayasu OOKA(Automobile R&D Center)、Atsushi SUZUKI(Automobile R&D Center)、Mitsushige GOTO(Automobile R&D Center)、Keita OTSUKA(Automobile R&D Center)、Yasumasa OKADA(Automobile R&D Center)

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