scholarly journals Comparative Study of Laser-Arc Hybrid Welding for AA6082-T6 Aluminum Alloy with Two Different Arc Modes

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 407 ◽  
Author(s):  
Xiaohui Han ◽  
Zhibin Yang ◽  
Yin Ma ◽  
Chunyuan Shi ◽  
Zhibin Xin
Keyword(s):  
Aluminum Alloy ◽  
Heat Affected Zone ◽  
Metal Transfer ◽  
Inert Gas ◽  
Hybrid Welding ◽  
Cold Metal Transfer ◽  
Melted Zone ◽  
Cold Metal ◽  
Fracture Features ◽  
Softening Region

The effects of arc modes on laser-arc hybrid welding for AA6082-T6 aluminum alloy were comparatively studied. Two arc modes were employed: pulsed metal inert gas arc and cold metal transfer arc. The results indicated that joints without porosity, undercutting, or other defects were obtained with both laser-pulsed metal inert gas hybrid welding (LPMHW) and laser-cold metal transfer hybrid welding (LCHW). Spatter was reduced, and even disappeared, during the LCHW process. The sizes of equiaxed dendrites and the width of the partially melted zone in the LPMHW joint were larger than those in the LCHW joint. The microhardness in each zone of the LPMHW joint was lower than that of the LCHW joint. The softening region in the heat-affected zone of the LPMHW joint was wider than that of the LCHW joint. The tensile strength of the LCHW joint was higher than that of the LPMHW joint. For the two joints, the fractures all occurred in the softening region in the heat-affected zone, and the fracture morphologies showed ductile fracture features. The dimples in the fractograph of the LCHW joint were deeper than those of the LPMHW joint.

scholarly journals Study and Characterization of EN AW 6181/6082-T6 and EN AC 42100-T6 Aluminum Alloy Welding of Structural Applications: Metal Inert Gas (MIG), Cold Metal Transfer (CMT), and Fiber Laser-MIG Hybrid Comparison

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 441
Author(s):  
Giovanna Cornacchia ◽  
Silvia Cecchel
Keyword(s):  
Aluminum Alloys ◽  
Fiber Laser ◽  
Large Scale ◽  
Metal Transfer ◽  
Inert Gas ◽  
Cold Metal Transfer ◽  
Structural Applications ◽  
Cold Metal

The present research investigates the effects of different welding techniques, namely traditional metal inert gas (MIG), cold metal transfer (CMT), and fiber laser-MIG hybrid, on the microstructural and mechanical properties of joints between extruded EN AW 6181/6082-T6 and cast EN AC 42100-T6 aluminum alloys. These types of weld are very interesting for junctions of Al-alloys parts in the transportation field to promote the lightweight of a large scale chassis. The weld joints were characterized through various metallurgical methods including optical microscopy and hardness measurements to assess their microstructure and to individuate the nature of the intermetallics, their morphology, and distribution. The results allowed for the evaluation of the discrepancies between the welding technologies (MIG, CMT, fiber laser) on different aluminum alloys that represent an exhaustive range of possible joints of a frame. For this reason, both simple bar samples and real junctions of a prototype frame of a sports car were studied and, compared where possible. The study demonstrated the higher quality of innovative CMT and fiber laser-MIG hybrid welding than traditional MIG and the comparison between casting and extrusion techniques provide some inputs for future developments in the automotive field.

Welding of aluminum alloy to zinc coated steel by cold metal transfer

2013 ◽  
Vol 49 ◽  
pp. 602-612 ◽  
Author(s):  
Shanglu Yang ◽  
Jing Zhang ◽  
Jin Lian ◽  
Yongpin Lei
Keyword(s):  
Aluminum Alloy ◽  
Metal Transfer ◽  
Coated Steel ◽  
Cold Metal Transfer ◽  
Zinc Coated Steel ◽  
Cold Metal

Study of Microstructure and Residual Stresses in Dissimilar Al/Steels Welds Produced by Cold Metal Transfer

2008 ◽  
Vol 571-572 ◽  
pp. 347-353 ◽  
Author(s):  
L. Agudo ◽  
S. Weber ◽  
Haroldo Pinto ◽  
Enno Arenholz ◽  
Juergen Wagner ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Stress State ◽  
Residual Stresses ◽  
Intermetallic Phase ◽  
Metal Transfer ◽  
Parent Material ◽  
Cold Metal Transfer ◽  
Residual Stress State ◽  
Cold Metal

Recently a new welding technique, the so-called ‘Cold Metal Transfer’ (CMT) technique was introduced, which due to integrated wire feeding leads to lower heat input and higher productivity compared to other gas metal arc (GMA) techniques. Here microstructure formation and residual stress state in dissimilar steel to aluminum CMT welds are investigated. The intermetallic phase seam between the filler and the steel is only a few micrometers thick. Residual stress analyses reveal the formation of the typical residual stress state of a weld without phase transformation. Both in longitudinal and in transversal direction compressive residual stresses exist in the steel plate parent material, tensile residual stresses are present in the heat affected zone of the steel and the aluminum alloy. The area containing tensile residual stresses is larger in the aluminum alloy due to its higher heat conductivity than in the steel. Due to the symmetry in the patented voestalpine welding geometry and the welding from bottom and face side of the weld, the residual stress distributions at the top and at the bottom side of the weld are very similar.

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