Topic
Arc welding
About: Arc welding is a research topic. Over the lifetime, 25393 publications have been published within this topic receiving 168182 citations.
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Patent•
01 Jul 2010
TL;DR: In this article, a welding with changing welding current intensity is carried out for a container body of the production series, resulting in a changing welding of the seam, ranging from the welding with a too high temperature to the welding of a too low temperature.
Abstract: In order to evaluate the welding current for the resistance seam welding of an overlap seam of container bodies, a welding with changing welding current intensity is carried out for a container body of the production series, resulting in a changing welding of the seam, ranging from the welding with a too high temperature to the welding with a too low temperature. The electric energy for this welding is determined several times during this welding and/or the temperature of the weld seam is determined several times and the welding current intensity is determined at which the welding of the individual container body is too cold and the welding current intensity at which the welding is too hot. This determination is based on the determined electric energy values and/or on the determined temperature values and based on this determination a preferred range for the welding current intensity within these limits of too hot and too cold is determined. By this, an evaluation if the welding current intensity is correct may take place in a simple way during the production. After the welding of the individual container bodies a changed welding current intensity lying between the welding current intensity of the too hot and of the too cold welding may optionally be set and used for the following series of container bodies of the production series.
40 citations
TL;DR: In this paper, gas tungsten arc welds were produced in two high strength, age hardenable aluminum alloys with and without an external magnetic field, and the decrease in grain size was found to increase tensile elongation, while the effect on strength and age hardening response was only meager.
Abstract: Grain size reduction in weld fusion zones confers the advantages of an increased resistance to solidification cracking and an improvement in mechanical properties. Oscillation of the welding arc through an imposed alternating magnetic field is one of several approaches to modify weld solidification structures. In this study, gas tungsten arc welds were produced in two high strength, age hardenable aluminum alloys with and without an external magnetic field. Metallographic characterization revealed the degree of structural refinement produced by magnetic arc oscillation. The decrease in grain size was found to increase tensile elongation, while the effect on strength and age hardening response was only meager. The improvement in ductility was partially maintained in the peak aged condition also.
40 citations
TL;DR: In this paper, the effect of EMF on resistance spot welding of high strength steel DP780 was investigated using an external magnetic field (EMF) produced by a pair of permanent magnets, and the results showed that under the same welding current, the EMF could refine the crystal grains, increase the weld nugget diameter and reduce the risk of shrinkage cavities.
Abstract: Electromagnetic stirring method has been used in casting and arc welding processes to refine crystal grains. In this paper, the authors describe an experiment where an external magnetic field (EMF) produced by a pair of permanent magnets was used to study the effect of electromagnetic stirring on resistance spot welding of advanced high strength steel DP780. Experimental results show that under the same welding current, the EMF could refine the crystal grains, increase the weld nugget diameter, reduce the risk of shrinkage cavities and significantly improve the joint’s tensile–shear strength and ductility. However, when the welds with and without the EMF were compared under the same weld diameter, because of the greatly reduced nugget thickness, the tensile–shear strength of the weld made under the EMF is a little bit lower than the normal weld.
40 citations
Patent•
02 Feb 2007TL;DR: In this article, the welding current is determined such that an average peak current IP avg is at 300 to 700 A, an average base time T b is at 5 to 30 ms, a current amplitude IP-a at a peak time of a high frequency pulse is at 50 to 600 A, and a current amortized IP b at a base time of an average frequency pulse was at 20 to 200 A, for which the size, release time and release direction of a drop are kept substantially completely constant.
Abstract: In a pulsed arc welding method of the invention, a shield gas made mainly of carbon dioxide gas is used, and a low frequency pulse of 30 to 100 Hz is continuously generated, on which a high frequency pulse with a pulse frequency of 500 to 2000 Hz is superimposed. In this case, the welding current is determined such that an average peak current IP avg is at 300 to 700 A, an average base time T b is at 5 to 30 ms, a current amplitude IP- a at a peak time of a high frequency pulse is at 50 to 600 A, and a current amplitude IP b at a base time of a high frequency pulse is at 20 to 200 A. This method ensures a reduced degree of biasing of a drop and an arc, for which the size, release time and release direction of a drop are kept substantially completely constant, and can achieve drop transfer wherein regularity of one pulse group-one drop transfer is very high. Hence, spatter and fume generation rates can be remarkably reduced.
40 citations
Patent•
07 May 1992
TL;DR: A gas arc metal welding gun has a handle which can be rotated freely with respect to a conduit containing a current transfer wire and a gas tube as discussed by the authors, and can be fitted with an adapter and tip assembly.
Abstract: A gas arc metal welding gun has a handle which may be rotated freely with respect to a conduit containing a current transfer wire and a gas tube and with respect to an adapter and tip assembly.
40 citations