Research on Resistance Spot Welding Process of Al-Si Coated Hot Stamping Formed Steel

RAN Maoyu; HU Xiumei

doi:10.7512/j.issn.1001-2303.2024.12.14

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Research on Resistance Spot Welding Process of Al-Si Coated Hot Stamping Formed Steel
Vol. 54, Issue 12, Pages: 90-95(2024)
Received：16 April 2024，

Revised：2024-09-10，

Published：25 December 2024
DOI： 10.7512/j.issn.1001-2303.2024.12.14
稿件说明：

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冉茂宇，胡秀梅.铝硅镀层热冲压成形钢电阻点焊工艺研究［J］.电焊机，2024，54（12）：90-95. DOI： 10.7512/j.issn.1001-2303.2024.12.14.

RAN Maoyu, HU Xiumei.Research on Resistance Spot Welding Process of Al-Si CoatedHot Stamping Formed Steel[J].Electric Welding Machine, 2024, 54(12): 90-95. DOI： 10.7512/j.issn.1001-2303.2024.12.14.

摘要

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。

Abstract

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.

关键词

Keywords

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