热输入对TTS443铁素体不锈钢激光焊接接头组织及性能的影响

韩丽营; 王新

doi:10.7512/j.issn.1001-2303.2025.04.16

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热输入对TTS443铁素体不锈钢激光焊接接头组织及性能的影响
Impact of Heat Input on the Structure and Properties of TTS443 Ferrite Stainless Steel Laser Welding Joints
2025年55卷第4期页码：122-127
收稿：2024-10-22，

纸质出版：2025-04-20
DOI： 10.7512/j.issn.1001-2303.2025.04.16
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韩丽营，王新.热输入对TTS443铁素体不锈钢激光焊接接头组织及性能的影响［J］.电焊机，2025，55（4）：122-127. DOI： 10.7512/j.issn.1001-2303.2025.04.16.

HAN Liying, WANG Xin.Impact of Heat Input on the Structure and Properties of TTS443 Ferrite Stainless Steel Laser Welding Joints[J].Electric Welding Machine, 2025, 55(4): 122-127. DOI： 10.7512/j.issn.1001-2303.2025.04.16.

摘要

采用激光自熔焊对热轧态的1.5 mm厚的TTS443铁素体不锈钢薄板进行试验，研究了不同焊接热输入对接头组织、显微硬度和静载拉伸性能的影响。结果表明，随着热输入增加，熔合区平均宽度增大，熔合区为粗大的铁素体柱状晶组织，母材区为细小均匀的铁素体组织，热影响区晶粒虽有明显长大但接近母材。焊接热输入低于20 J/mm时，焊缝未焊透；焊接热输入大于20 J/mm时，焊缝成形良好，但随着热输入增加，熔合线位置颜色加深，焊缝美观度降低。当焊接热输入为24 J/mm时，接头成形美观，显微硬度从焊缝中心到热影响区一直到母材部分呈下降趋势，且静载拉伸性能达到母材的95%以上，能够满足实际生产应用。

Abstract

Laser self-fusion welding experiments were conducted on 1.5 mm thick hot-rolled TTS443 ferrite stainless steel sheets to study the effects of different welding heat inputs on the joint structure

microhardness

and static tensile properties. The results show that as the heat input increases

the average width of the fusion zone increases. The fusion zone has a coarse ferrite columnar grain structure

while the base metal zone has a fine and uniform ferrite structure. Although the grain size in the heat-affected zone grows significantly

it is close to that of the base metal. When the welding heat input is less than 20 J/mm

the weld is not penetrated; when the welding heat input is greater than 20 J/mm

the weld formation is good

but as the heat input increases

the color at the fusion line deepens

reducing the aesthetic appearance of the weld. When the welding heat input is 24 J/mm

the joint formation is aesthetically pleasing. The microhardness shows a decreasing trend from the center of the weld to the heat-affected zone and all the way to the base metal

and the static tensile properties reach more than 95% of the base metal

meeting the requirements for actual production applications.

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references

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