Topic
Butt welding
About: Butt welding is a research topic. Over the lifetime, 7153 publications have been published within this topic receiving 44467 citations.
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TL;DR: In this article, the laser weldability for tailor-welded blanks (TWBs) made of dissimilar hot-stamping steels was examined and the mechanical and metallurgical characteristics of the welds were then analyzed.
Abstract: In this research, the laser weldability for tailor-welded blanks (TWBs) made of dissimilar hot-stamping steels was examined. Usibor and Ductibor from ArcelorMittal were combined, since they are steels that possess a high-strength and high-energy absorption, respectively. Additionally, combination of Usibor and SPRC440 was investigated for comparison. After laser butt welding, the specimens were heat-treated at high temperatures, and the subsequent quenching conditions were similar to those in the hot-stamping process. The mechanical and metallurgical characteristics of the welds were then analyzed. The TWBs with Usibor and Ductibor exhibited a high degree of elongation after hot-stamping but those with Usibor and SPRC440 showed a relatively low elongation. The AlSi coating on the base metal was included in the fusion zone, and it led to ferrite formation. However, in the static and high-speed tensile tests, the AlSi coating did not affect the tensile strength of the TWBs, and all tensile specimens were fractured at the base metal of Ductibor.
13 citations
22 Mar 2018
TL;DR: In this paper, a comparison between the position and orientation of different materials was performed by varying the welding speed while keeping the rotational speed constant, and the results indicated that the heat input was reduced when the AA7050 alloy was located in the advancing side (AS) of the joint.
Abstract: Friction stir welding (FSW) was carried out for the butt joining of dissimilar AA2024-T3 and AA7050-T7651 aluminium alloys with 2-mm thicknesses. A comparison between the position and orientation of different materials was performed by varying the welding speed while keeping the rotational speed constant. Through an analysis of the force and torque produced during welding and a simple analytical model, the results indicate that the heat input was reduced when the AA7050 alloy was located in the advancing side (AS) of the joint. The different material positions influenced the material transportation and the interface in the centre of the stir zone (SZ). The microhardness of both materials was lower when they were in the AS of the joint. The differences in the hardness values were reduced at higher welding speeds when the heat input was decreased. The mechanical performance increased when the lower strength alloy was located in the AS. The material orientation exhibited a small influence when the AA7050 alloy was in the AS and in general on the resulting microhardness for all the cases analysed. The tensile strength values were very similar for both orientations, but an increase in the yield strength could be measured when the materials were oriented in the transverse direction.
13 citations
TL;DR: In this paper, the effects of the welding residual stresses on the creep crack growth and a number of associated crack growth parameters were investigated for a typical low-alloy steel butt weld with 2¼Cr1Mo weld metal under a given set of internal pressure, temperature and system moment.
13 citations
Patent•
26 Apr 1982
TL;DR: In this article, an automatic welding of confronting edges of two bodies between which is a groove to be filled with filler material and conditioning, processing and use of control signals for automatic operation is described.
Abstract: This invention relates to automatic welding of confronting edges of two bodies between which is a groove to be filled with filler material and, more particularly, to conditioning, processing and use of control signals for automatic operation.
13 citations
TL;DR: In this paper, the microstructures of the TIG weld joints were analyzed and the results indicated that the welding quality of the high boron Fe-Ti-B alloys is very good, there are no obvious defects such as cracks, lack of fusion, incomplete penetration and strip defects in the butt weld joints.
13 citations