STUDIES ON FRICTION WELDING OF CARBON AND ALLOY STEELS : 1st Report, A New Method for Determining Welding Conditions

概要

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In order to obtain friction-welded joints with enough strength under static and cyclic loads the friction coefficient at the contact surfaces being welded was measured during welding process. It was found that the heating pressure and the heating time which brought about a friction coefficient of μ=0.13 corresponded to the lower limit of welding conditions for producing joints with enough strength in the case of a standard rubbing speed of about 3m/s. From the measurement of the temperature and the shear flow stress at the rubbing surface, it was found that the temperature was in the range of 1100℃ to 1200℃ for an S35C-steel when μ=0.13 was achieved. Rubbing virgin-surfaces of the steel under this temperature could be joined completely at an upsetting pressure of about 59 MPa (6 kgf/mm^2). The welding conditions obtained using a carbon steel would be applicable to other carbon steels and alloy steels because these steels show much the same flow stress at temperatures by about 200゜to 300℃ lower than their melting points.
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