Automated tandem gas metal arc welding (T-GMAW) has been identified as a welding system potentially capable of increasing productivity and minimising distortion in the fabrication of ship panels. The T-GMAW process was used in pulse-pulse mode on 6 mm plain carbon steel plate to determine the effect of welding travel speed (WTS) (1.0-2.0 m/min) and contact tip-to-workpiece distance (CTWD) (2035 mm) on weld metal microstructure and bead profile. In this mode, the leading and trailing welding wires transfer metal alternately into a single molten weld pool at welding travel speeds much greater than those used in conventional single-wire gas metal arc welding (GMAW). The bead-on-plate (BOP) welding of 6 mm plain carbon steel plate resulted in adequate weldpool mixing and an acceptable level of microstructural homogeneity in the solidified weld metal for the welding conditions investigated. BOP welding tests were also undertaken on 20 mm plain carbon steel plate which results in a greater weld cooling rate compared with the thin 6 mm plate. In the 20 mm plate, a relatively homogenous weld metal microstructure was also present, but there was evidence of limited weld pool mixing. Also, in-situ analysis of the arcs during welding and post-test characterisation of the BOP samples showed that arc stability and bead profile are sensitive to both CTWD and WTS.
The effect of travel speed and CTWD on the bead profile and microstructure of tandem GMA steel welds
Australian Welding Journal ; 56 , 1 ; 40-46
2011
7 Seiten, 11 Bilder, 3 Tabellen, 12 Quellen
Aufsatz (Zeitschrift)
Englisch
Bead by bead, welds hold pressure
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