Abstract
Multi-wire welding has received much attention in the machinery industry due to its high efficiency. The aim of this study was to investigate a novel pulse gas metal arc welding (GMAW) that has circular triple-wire electrodes. The effect of the pulse phage angle on arc stability was particularly studied. Research showed that for typical phase angles the arc stability from low to high is 180°, 0°, and 120°, and the arcs are very stable at 120°. The triple-wire welding was used to weld a 9 mm thick Q960E steel, which is typically used for the arm of construction machinery. When the welding heat input was controlled at 1.26–1.56 kJ/mm, the weld zone was dominated by acicular ferrite, and the coarse-grained zone of the heat-affected zone was a mixed structure of lath martensite and lath bainite. The tensile strength of the welded joint reached 85% of the base metal and the impact toughness was above 62 J, which can meet the requirements of construction machinery. This indicates that the triple-wire welding has great potential to achieve efficient and high-quality welding for the construction machinery.
Highlights
Welding is an important material processing technology in modern industrial production, and the improvement of welding efficiency plays an important role in the improvement of total productivity [1]
At the 120◦ phase angle, when the welding heat input was controlled at 1.26–1.56 kJ/mm, the structure of the weld zone was dominated by acicular ferrite, and the coarse-grained zone of the heat-affected zone was a mixed structure of lath martensite and lath bainite
This paper presents the experimental investigation of an integrated circular triple-wire pulse gas metal arc welding (GMAW) of Q960E high-strength steel for construction machinery
Summary
Welding is an important material processing technology in modern industrial production, and the improvement of welding efficiency plays an important role in the improvement of total productivity [1]. With the advantages of high quality and low cost, gas metal arc welding (GMAW) is one of the most dominant methods of welding. GMAW utilizes an electric arc to melt two pieces of metals, and the metals are joined together after cooling. How to improve the efficiency of the GMAW process has always been a key issue in welding research [2,3]. There are several alternatives for raising the efficiency of GMAW process, such as using direct current electrode negative (DCEN) operation, extended electrical stick out, high operating current, or a combination of these effects [5,6,7,8].
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