Year-end Sale % OFF 
Abstract
It is considered to be available in reducing the weight of automobiles that the aluminum alloy is applied to manufacture them. The spot welding of aluminum alloys is difficult because of high welding current and small electrical resistance. It is necessary to clarify the relation between the nugget formation and the welding conditions. In this study, the relation between the spot welding conditions and the nugget form was investigated, and the joint strength and the fracture mode were investigated. As a result, the nugget area and micro cracks in the HAZ were increased with increase of the welding current. It is found that in case of aluminum alloys the formation of micro cracks was a main factor of reduction of maximum tensile load of the welded zone.
Highlights
The reduction of CO2 emissions from automobiles has become an important issue from the viewpoint of global environmental conservation
We examined the relationships (1) between spot-welding conditions and the shape of nuggets and (2) between the shape of nuggets and the tensile load at the spot-welded zone obtained during the cross-tensile test, and compared the results with those of the spot-welded zone of steels
From the results of visual, microstructural, and scanning electron microscopy (SEM) observations, we examined the growth of nuggets under different spot-welding conditions, the generation of welding defects, and the effect
Summary
The reduction of CO2 emissions from automobiles has become an important issue from the viewpoint of global environmental conservation. There are several methods of reducing the weight of automobiles. There are several methods of joining body panels of automobiles, such as spot welding, self-piercing riveting,2) and friction stir welding.3) Recently, spot welding has been frequently used because of its high productivity and low cost. Spot welding is appropriate for materials with a high electric resistance, such as steels; it requires approximately twice as much current in the case of materials with a low electric resistance, such as aluminum alloys. A dedicated system for spot welding of aluminum alloys that can bear a high-capacitance power source and high current is required. In some cases, increasing the size of welding machines and the installation or expansion of the plant’s power-receiving equipment are required.4)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
