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 article, the influence of zinc coating on the nugget development during resistance spot welding of Zn coated steel sheets using rounded tip electrodes was investigated using an experimental observation of zinc behaviour coupled with a numerical Electro-Thermo-Metallurgical-Mechanical analysis.
34 citations
Journal Article•
TL;DR: In this paper, an investigation was undertaken to examine whether differences exist in the resistance spot welding behavior of 780 MPa dual-phase steel with HDGA coating compared to the one coated with HDGI coating.
Abstract: Dual-phase steels are commercially available with hot-dipped galvanneal (HDGA) or hot-dipped galvanize (HDGI) coatings. An investigation was undertaken to examine whether differences exist in the resistance spot welding behavior of 780 MPa dual-phase steel with HDGA coating compared to the one coated with HDGI coating. The resistance spot welding evaluations consisted of determining the welding current ranges for the steels with HDGA and HDGI coatings by determining the current required to obtain the minimum weld size and the current required to cause expulsion of weld metal. Shear-tension and cross-tension tests were performed on spot welds made on steels with both HDGA and HDGI coatings. Weld cross sections from both types of coatings were examined for weld quality. Weld microhardness profiles were determined to examine hardness variations across the welds. Cross sections of HDGA and HDGI coatings as well as the electrode tips after welding were examined using a scanning electron microscope. Composition profiles across the coating depths were analyzed using a glow-discharge optical emission spectrometer to understand the role of coating in resistance spot welding. Contact resistance was measured to examine its contribution to the current required for welding. The results indicated that 780 MPa dual-phase steel showed similar overall welding behavior with HDGA and HDGI coatings. Further, weld shear and cross-tension strengths were independent of the type of coating. The results of the study are presented along with a discussion of the structure and the role of coatings in welding. A brief discussion of the physical metallurgy of 780 MPa dual-phase steel is presented to explain weld microstructural evolution.
34 citations
TL;DR: Refill friction stir spot welding (RFSSW) was successfully used to join dissimilar Al/Mg alloys in this article, and the effect of joining time on the microstructure and mechanical properties of the welded joints was studied.
34 citations
TL;DR: In this article, a tool with a half-threaded pin aiming to enhance the material flow at the lap interface but induces lower heat input was successfully put forward and manufactured using alclad 2A12-T4 aluminum alloy as the research object.
34 citations
Patent•
01 Apr 1983TL;DR: In this paper, an instrumented spot welding electrode is used to provide real-time measurements of key multivariable resistance welding parameters, which can be used as inputs to adaptively control welding machines and dynamically adjust welding system operation responsive to sensed variables.
Abstract: An instrumented spot welding electrode significantly improves the weld quality available from production resistance spot welding machines by providing real time measurements of key multivariable resistance welding parameters. The real time data provided may be used as inputs to adaptively control welding machines and dynamically adjust welding system operation responsive to the sensed variables. A number of sensors are positioned within a cavity specially formed into a water cooled electrode tip to obtain the desired measurements while being protected against physical damage. The sensors are advantageously placed in good thermal and electrical contact with a plug element which bears directly on the workpieces being welded to enhance the accuracy of the sensed variables. This specially configured and instrumented sensor cavity is ideally suited for use with all end types of electrodes including spherical, truncated, offset, flat and the like.
34 citations