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Resistance spot welding technique for steel workpiece with coating layer

A process method and resistance spot welding technology, applied in resistance welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of affecting the appearance of the car body, affecting the performance of welding joints, reducing the service life of electrodes, etc., to ensure the feasibility , the effect of suppressing splashes and reducing the impact

Active Publication Date: 2017-11-17
江苏育材堂车身技术有限公司 +1
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Problems solved by technology

[0004] Spattering in the welding of car body manufacturing will not only affect the performance of the final welded joint, but also cause frequent electrode grinding and reduce the service life of the electrode; the sputtered metal is attached to the surface of the car body, which affects the appearance of the car body surface. Clear processing, increasing production costs

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  • Resistance spot welding technique for steel workpiece with coating layer
  • Resistance spot welding technique for steel workpiece with coating layer
  • Resistance spot welding technique for steel workpiece with coating layer

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Embodiment Construction

[0030] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the implementation process of how to apply technical means to solve technical problems and achieve corresponding technical effects in the present invention. The embodiments of the present application and the various features in the embodiments can be combined with each other under the premise of no conflict, and the formed technical solutions are all within the protection scope of the present invention.

[0031] In the production of automobile body manufacturing, it involves resistance spot welding of coated steel workpieces, such as the welding of DP950 galvanized coated sheets and aluminum-silicon-coated 1500MPa hot stamping sheets. The inventor studies the resistance spot welding performance of this welding relationship and finds that:

[0032] In the existing welding process, after the weldi...

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Abstract

The invention discloses a resistance spot welding technique for steel workpiece with a coating layer. According to the technique, the steel workpiece to be welded is connected in a lap joint mode, pressure is applied to the lap joint, and is increased and maintained; a first welding current is applied to the lap joint, and is enabled to continuously act for a first time; then the first welding current is removed and a second time is maintained; after the second time is maintained, a second welding current is applied to the lap joint, and is enabled to continuously act for a third time; after keeping for the third time, the second welding current is gradually reduced to zero within a fourth time; and wherein the second welding current is larger than the first welding current, and the sum of the first time and the second time is larger than or equal to 600 ms. The technique has the advantages that the coating layer is damaged by outputting the first welding current, the second welding current is output to complete heating welding, a longer stopping output timing sequence is arranged between the two, coating material is promoted to be discharged, splashing is inhibited, and a wide process window can be obtained.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a resistance spot welding process method for a coated steel workpiece. Background technique [0002] In the resistance spot welding process, the phenomenon that the molten parent metal flies out from the joint surface of the lapped plates or from the contact surface between the plate and the electrode during welding is called "splash". After the spatter occurs, the sputtered metal adheres to the surface of the electrode, which affects the welding effect of the electrode, which in turn causes frequent electrode grinding and shortens the service life of the electrode; and the spatter is accompanied by internal defects of the spot welded joint, which affects the strength of the welded joint. Generally, the current when spatter occurs is called the splash current or the upper limit current, and the current that ensures the reference nugget diameter is called the lower li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K103/04
CPCB23K11/115B23K2103/04
Inventor 易红亮李峥先王义斌高宪臣贺东方
Owner 江苏育材堂车身技术有限公司
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