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External heat assisted welding of dissimilar metal workpieces

一种外部加热、工件的技术，应用在金属加工设备、焊接设备、焊接/焊接/切割物品等方向，能够解决长的时间、高消耗性成本等问题

Active Publication Date: 2017-10-31
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared to spot welding, mechanical fasteners take longer to put in place and have high expendable costs

Method used

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  • External heat assisted welding of dissimilar metal workpieces
  • External heat assisted welding of dissimilar metal workpieces
  • External heat assisted welding of dissimilar metal workpieces

Examples

Experimental program
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Embodiment Construction

[0023] Figure 1 to Figure 12A preferred and exemplary embodiment of the method of resistance spot welding of aluminum workpieces and adjacent overlapping steel workpieces of the present invention is shown. The disclosed method attempts to counteract the thermal imbalance that naturally occurs between aluminum and steel workpieces by supplying heat from an external source to a welding electrode positioned adjacent to the aluminum workpiece during current flow as necessary. The introduction of external heat to the aluminum side of the welding electrode may be performed in conjunction with limiting or stopping the flow of cooling fluid through the electrode, if desired. By supplying heat to the aluminum side of the welding electrode at specific times during the resistance spot welding process, the formation of Fe,Al intermetallic layers can be inhibited and / or the solidification of the molten aluminum pool produced within the aluminum workpiece can be altered Behavior to minimi...

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Abstract

A method of resistance spot welding a workpiece stack-up that includes an aluminum workpiece and an adjacent overlapping steel workpiece is disclosed. The method uses a first welding electrode positioned proximate the aluminum workpiece and a second welding electrode positioned proximate the steel workpiece to effectuate the spot welding process. In an effort to positively affect the strength of the ultimately-formed weld joint, external heat may be supplied to the first welding electrode by an external heating source disposed in heat transfer relation with the first welding electrode either before or after, or both before or after, an electrical current is passed between the first and second welding electrodes to create a molten aluminum weld pool within the aluminum workpiece.

Description

technical field [0001] The technical field of the invention relates generally to resistance spot welding, and more particularly to resistance spot welding of aluminum workpieces and adjacent overlapping steel workpieces. Background technique [0002] Resistance spot welding is a process used by several industries to join two or more metal workpieces together. For example, the automotive industry often uses resistance spot welding to join metal workpieces during the manufacture of vehicle closures (such as doors, hoods, deck lids, or liftgates) and body structures (such as body sides and cross members) . Multiple welds are often formed along the peripheral edge or some other bonding area of ​​the metal workpiece to ensure that the part is structurally sound. While spot welding is commonly practiced to join together certain metal workpieces of similar composition (e.g., steel-to-steel and aluminum-to-aluminum), the desire to incorporate lighter weight materials into body str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K11/20
CPCB23K11/115B23K11/20B23K2103/18B23K2103/20
Inventor D·R·西格勒杨上陆A·K·萨契戴夫
Owner GM GLOBAL TECH OPERATIONS LLC
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