铝硅镀层热冲压成形钢电阻点焊工艺研究
Research on Resistance Spot Welding Process of Al-Si Coated Hot Stamping Formed Steel
- 2024年54卷第12期 页码:90-95
收稿:2024-04-16,
修回:2024-09-10,
纸质出版:2024-12-25
DOI: 10.7512/j.issn.1001-2303.2024.12.14
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收稿:2024-04-16,
修回:2024-09-10,
纸质出版:2024-12-25
移动端阅览
采用中频逆变点焊机对1 500 MPa级铝硅热冲压成形钢进行点焊工艺试验,研究了单脉冲、双脉冲和三脉冲工艺下的焊接工艺性、接头强度和焊接工艺窗口。结果表明,钢板表面的铝硅镀层在热成形后在钢板表面形成不均匀的合金相,影响电阻点焊的接触电阻。单脉冲焊接工艺性最差,存在表面飞溅和心部飞溅。双脉冲焊接工艺性较好,焊接电流范围在4.6~5.6 kA之间获得稳定的焊接熔核,工艺窗口为1 kA。三脉冲焊接具备了双脉冲良好的焊接工艺性,同时将钢板的焊接工艺窗口提高到1.6 kA的水平。点焊接头存在软化区,软化区组织为回火马氏体、粒状贝氏体和残余奥氏体的混合组织,三脉冲工艺的软化区间大于双脉冲工艺的软化区间。
The paper utilizes an Inverter DC spot welding machine to perform spot welding process tests on 1500 MPa Al-Si hot stamping steel. It investigates the welding process
joint strength
and the process window for spot welding under single-pulse
double-pulse
and triple-pulse regimes. The findings indicate that the aluminum-silicon coating on the steel plate forms an irregular alloy phase on the surface post hot forming
which impacts the resistance during spot welding. The single-pulse welding is most affected by surface and core spatter issues. The double-pulse welding exhibits improved results
achieving a stable weld nugget within a welding current range of 4.6 kA to 5.6 kA
with the spot welding process window extending up to 1 kA. Triple-pulse welding not only retains the favorable weldability of the double-pulse method but also expands the welding process window for steel plates to approximately 1.6 kA. Within the spot weld
a softened zone is present
characterized by a microstructure composed of tempered martensite
granular bainite
and retained austenite. The three-pulse technique results in a larger softening range compared to the double-pulse method.
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