Pulsed Arc Welding: An Introduction
By J A Street
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Pulsed Arc Welding - J A Street
England
Preface
This special report describes how the conventional continuous DC TIG and MIG welding processes of post-war years eventually became unable to meet the joining requirements of advanced materials and the increasingly demanding joint geometries of complex assemblies, such as those in nuclear power stations, thereby holding back progress in some vitally important areas of technology.
It identifies the limited performance of the available welding equipment which resulted in inadequate process control, and outlines the restricted knowledge of arc behaviour and metal transfer, all of which had to be systematically examined, quantified and understood before useful improvements could be made.
The importance of precisely controlled welding sets and accurate instrumentation is emphasised, as both were crucial not only in the development of the pulsed AC and DC arc welding processes to their present sophisticated states but also for the reproducible transfer of welding procedures from development laboratory to worksite for reliable quality assurance.
The main theme of the report is concerned with evaluation of the benefits of current pulsing in TIG and MIG welding. In this evaluation various forms of thermal pulsing in TIG and MIG welding, and droplet pulsing in the MIG process, are described in detail to show how the new techniques were introduced and developed to overcome the difficulties associated with the old. Some disadvantages of pulsing are also included to stress the importance of choosing an appropriate level of technology to fulfil a given requirement.
Although not a review, some comparisons between processes and techniques are inevitable when spanning almost 30 years of technological advancement, so a little relevant historical information has been included to provide a frame of reference for the benefit of the reader.
Finally, the report compares various types of welding sets and their modes of operation, and examines different degrees of complexity in programmable welding sets, to make a prediction of where trends are likely to lead in the future.
Between 1962-85 the author was personally involved in development and evaluation of all the pulsed welding processes described here, and of instrumentation techniques to quantify them. He was a Senior Research Engineer on Welding Institute research programmes which resulted in the origination and/or development of pulsed AC and DC TIG, pulsed wire feed spray MIG and AC MIG welding, and Project Leader for synergic pulsing. As a member of the small team working on transistor analog welding sets and fast response, positive drive, wire feeders he participated in development and, in particular, application of specialised instrumentation needed for evaluation of the new processes and equipment. He has also been responsible in the capacity of Principal Research Engineer for promotion of the Institute’s advanced arc welding instrumentation in Europe, Scandinavia and the USA as well as the UK by demonstration of equipment and presentation of papers at workshops and