Selection of parameters of pulsed current gas metal arc welding

Effect of welding sequence on residual stress and distortion in flat-bar stiffened plates

Mathematical modeling of melting rate in twin-wire welding

Mathematical modelling of melting rate in arc welding with a triple-wire electrode

CHAPTER 7 – Metal Transfer and Mass Flow in the Weld Pool

In this second part of their paper, the Authors develop a simple conduction-based theoretical model to describe aspects of the results presented in Part 1 , with particular emphasis on dilution behaviour. The model is combined with calorimetric heat transfer measurements in order to investigate the finding that only a small fraction of the total process power is required to melt observed plate fusion-zone areas. A dual heat source' fusion model is suggested in which plate melting is largely in response to direct arc heating, providing a means of optimising plate dilution and so reducing the risk of fusion defects. These and other aspects of the problem are considered in some detail; apart from the choice of mean current and welding speed, only limited opportunities appear to exist for manipulating the plate fusion characteristics; dilution may be maximised by increasing arc cathode heating, use of preheat, and by choice of wire size and/or pulse structure.

C J Allum

Papers

Control of fusion characteristics in pulsed current mig welding. part 2 - simple model of fusion characteristics