Resistance Spot Welding Compression for High-Tensile Steel
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Solution Overview
Problem
Resistance spot welding of high-tensile steel plates often results in breakage due to tensile stress generated after welding, which is challenging to address without limiting material options or requiring repetitive testing to achieve a specified zinc content.
Innovation Solution
A method and apparatus for resistance spot welding that involves compressing a high-tensile steel plate in a direction intersecting its thickness during and after welding, using a compressing mechanism with pressurizing members to apply compressive stress, thereby canceling out tensile stress and preventing breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistance spot welding is performed on high-tensile steel plates without compressive stress application, then the welding process is simple, but tensile stress generated after welding causes breakage
Solution Approach 1:
The compressive stress is applied to the high-tensile steel plate before welding begins, creating a pre-compressed state that counteracts the tensile stress generated during and after welding. This preliminary action prevents breakage without requiring complex post-welding interventions.
Solution Approach 2:
Compressive stress is applied in advance to counteract the harmful tensile stress that would otherwise cause breakage. The compression force acts as a preliminary anti-action against the anticipated tensile stress, ensuring weld integrity.
2Reliability
If the amount of zinc component in steel plate is controlled to prevent breakage, then breakage is inhibited, but material selection is limited and repetitive testing is required
Solution Approach 1:
Instead of controlling the chemical composition (zinc content) of the steel plate, the invention changes the mechanical parameter by applying compressive stress during welding. This parameter change allows prevention of breakage without restricting material selection or requiring repetitive testing for zinc content optimization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach inhibits breakage of high-tensile steel plates by maintaining compressive stress until cooling is complete, ensuring dynamic stability during welding and improving the quality of the weld, without the need for limiting material options or repetitive testing.
Implementation Method 1
the first steel plate is compressed in a direction that intersects a thickness direction of the first steel plate at least from during welding of the workpiece until completion of welding of the workpiece
Implementation Method 2
the compressive stress cancels tensile stress that is generated after welding; and therefore, breakage of the first steel plate is inhibited
Implementation Method 3
resistance spot welding apparatus comprises a first electrode configured to contact a first steel plate; and a second electrode configured to contact a second steel plate
Data Source
AI summary
Provided is a method of resistance spot welding that can inhibit breakage of a high-tensile steel plate without materials being limited. One aspect of the present disclosure is a method of resistance spot welding including welding of a workpiece made of layered steel plates with a resistance spot welding apparatus. The resistance spot welding apparatus includes a first electrode contacting a first steel plate that is a high-tensile steel plate among the steel plates, and a second electrode contacting a second steel plate having less tensile strength than the first steel plate among the steel plates and configured such that the workpiece is interposed between the first electrode and the second electrode. In the welding, the first steel plate is compressed in a direction that intersects a thickness direction of the first steel plate at least from during welding of the workpiece until completion of welding of the workpiece.