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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

HEAT TRANSFER CHARACTERISTICS OF ULTRA PULSE WELDING

Get access (open in a dialog) DOI: 10.1615/IHTC6.4070
pages 79-84

要約

Ultra pulse welding has welding times of the order of a few milliseconds. The advantages of utilizing ultra pulse welding are that it results in less distortion of the workpieces and that it permits the maintenance of very close tolerances. The ultra pulse welding process is treated as a one-dimensional heat conduction problem with phase change, and is divided into two stages: the heating stage and the melting stage. In the heating stage, the temperature at the contact surface rises until it reaches the melting point. Then the melting stage follows. In the melting stage, temperature distributions in the solid and liquid phases are coupled with the moving phase front between the solid and liquid phases. By making use of the heat balance integral method, heat transfer characteristic features, such as temperature distributions, the minimum pulse duration required for ultra pulse welding, and the thickness of the welded zone, are analytically determined. Two dimensionless parameters are involved in the process. One parameter is the ratio of the thermal diffusivities of the solid and liquid phases. The other is the modified phase change parameter.