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1. (WO2018178933) WELDING APPARATUS AND METHOD

Pub. No.:    WO/2018/178933    International Application No.:    PCT/IB2018/052200
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Fri Mar 30 01:59:59 CEST 2018
IPC: B23K 11/24
B23K 11/25
Applicants: MACGREGOR WELDING SYSTEMS LIMITED
Inventors: AHERNE, Mark
BROWN, Ian Cornelius
Title: WELDING APPARATUS AND METHOD
Abstract:
The present invention relates micro resistance welding apparatus and to a method of welding. In particular, the present invention relates to small scale or micro welding apparatus and to a method of micro resistance welding using a controlled sequence of current, voltage and/or power signal profile for an electric arc. The invention provides a welding apparatus comprising: a controller supplying a controlled drive current to a weld head circuit in which the controller supplies said controlled drive current in dependence upon electrical feedback from the weld head circuit and in which the controlled drive current is defined by a sequence of segments and for each segment the welding apparatus operates in a mode defined by setting one of a predetermined current target, a predetermined voltage target or a predetermined power target; and at least two of the segments are operated in a different mode from one another. The invention also provide a method of operating such an apparatus.