Topic
Spot welding
About: Spot welding is a research topic. Over the lifetime, 12491 publications have been published within this topic receiving 89845 citations. The topic is also known as: Spot_welding.
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TL;DR: In this paper, the influence of Nd:YAG laser welding parameters on the cracking severity of AA 2024 alloy was studied in two modes: single spot welding and overlap spot welding.
Abstract: Aluminium alloy AA2024 is one of the most susceptible alloys to solidification cracking. The influence of Nd:YAG laser welding parameters on cracking severity of AA 2024 alloy was studied. Welding was performed in two modes: single spot welding and overlap spot welding. In single spot welding mode, the formation of columnar zone increases cracking severity in the fusion zone. In overlap spot welding mode, the solidification cracks were characterised as: cracks propagated from previous spot, cracks initiated from the fusion line with the previous spot, and cracks initiated from the fusion line with the base metal. It was established that in comparison there is very limited tendency for initiation of new cracks from the fusion line with the weld metal of a previous spot.
26 citations
TL;DR: In this article, the root mean square (RMS) value of the continuous acoustic emission was measured, revealing a peak that reflects the evolution of martensite formation during cooling of the spot weld.
Abstract: The martensitic transformation during gas tungsten arc (GTA) welding of steel 42CrMo4 has been studied using the acoustic emission (AE) monitoring technique. Welds were produced under static conditions (spot welding) and under stationary conditions (travelling arc welding). After spot welding, the root mean square (RMS) value of the continuous acoustic emission was measured, revealing a peak that reflects the evolution of martensite formation during cooling of the spot weld. The RMS value was also measured during travelling arc welding at different heat inputs and corrected for the noise of the welding process to obtain the RMS value due to martensite formation. After welding, optical metallography was carried out to quantify the amount of martensite formed during cooling of the weld. An analysis of the results shows that the squared RMS value is proportional to the volume rate of martensite formation during welding, which is consistent with theory and in good agreement with the results obtained in the case of spot welding. The obtained results suggest that AE can be applied as a real time monitoring technique for the detection of martensite formation during steel welding.
26 citations
01 Jan 2014
TL;DR: In this article, the development and progress of robotization in welding over the years and also discusses many advantages and disadvantages of different robotic welding technologies are discussed, as well as the advantages and drawbacks of different robot welding technologies.
Abstract: Since the first industrial robots were introduced in the early 1960s, the development of robotized welding has been truly remarkable and is today one of the major application areas for industrial robots. Robot welding is mainly concerned with the use of mechanized programmable tools, known as robots, which completely automate a welding process by both performing the weld and handling the part. Robots are quite versatile and hence have been used for a variety of welding types such as resistance welding and arc welding. This chapter describes the development and progress of robotization in welding over the years and also discusses many advantages and disadvantages of different robotic welding technologies.
26 citations
TL;DR: Two-stage refilled friction stir spot welding (TFSSW) is a novel refilling process, based on conventional FSSW as mentioned in this paper, which is done in two steps and with two independent tools, conventional and refilling tool.
26 citations
Patent•
15 Feb 2006
TL;DR: In this paper, a tool for friction stir spot welding of high melting temperature materials is described, where the tool geometry includes a short pin (44) and broad shoulder (42) to enhance mixing of high temperature materials.
Abstract: A tool (40) for friction stir spot welding of high melting temperature materials, wherein the tool geometry includes a short pin (44) and broad shoulder (42) to enhance mixing of high temperature materials, and wherein the tool (40) includes a superabrasive coating to thereby enable FSSW of high melting temperature materials.
26 citations