50 mm厚SA508Gr.3Cl.2钢超窄间隙激光填丝焊接头组织与性能 
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Microstructures and Properties of 50 mm Thick SA508Gr.3Cl.2 Steel Welding Joints by Ultra-Narrow-Gap Laser Welding with Filler Wire
1 上海交通大学材料科学与工程学院上海市激光制造与材料改性重点实验室, 上海 200240
2 上海电气核电设备有限公司, 上海 200245
3 高新船舶与深海开发装备协同创新中心, 上海 200240
图 & 表
图 1. 焊件坡口尺寸
Fig. 1. Groove geometry of workpiece
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图 2. 显微硬度测量及冲击试样取样位置
Fig. 2. Measurement position of microhardness and sampling position of impact sample
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图 3. 拉伸试样尺寸
Fig. 3. Dimensions of tensile sample
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图 4. 焊接接头的宏观形貌
Fig. 4. Macromorphology of welding joint
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图 5. 激光自熔焊焊道形貌。(a)宏观形貌;(b)图5(a)中位置1'的局部放大;(c)图5(a)中位置2'的局部放大
Fig. 5. Weld pass morphologies in autogenous laser welding. (a) Macromorphology; (b) partially enlarged view of position 1' in Fig. 5(a); (c) partially enlarged view of position 2' in Fig.5 (a)
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图 6. 多层焊接头的区域划分
Fig. 6. Regional division of multi-layer welding joint
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图 7. 中部激光填丝焊焊道形貌。(a)宏观形貌;(b)图7(a)中位置A'的局部放大;(c)图7(a)中位置B'的局部放大;(d)图7(a)中位置C'的局部放大;(e)图7(a)中位置D'的局部放大;(f)图7(a)中位置E'的局部放大
Fig. 7. Middle weld pass morphologies in laser welding with filler wire. (a) Macromorphology; (b) partially enlarged view of position A' in Fig. 7(a); (c) partially enlarged view of position B' in Fig. 7(a); (d) partially enlarged view of position C' in Fig.7 (a); (e) partially enlarged view of position D' in Fig. 7(a); (f) partially enlarged view of position E' in Fig. 7(a)
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图 8. 上部激光填丝焊焊道形貌。(a)宏观形貌;(b)图8(a)中位置4的局部放大;(c)图8(a)中位置5的局部放大;(d)图8(a)中位置6的局部放大;(e)图8(a)中位置7的局部放大;(f)图8(a)中位置8的局部放大
Fig. 8. Top weld pass morphologies in laser welding with filler wire. (a) Macromorphology; (b) partially enlarged view of position 4 in Fig. 8(a); (c) partially enlarged view of position 5 in Fig. 8(a); (d) partially enlarged view of position 6 in Fig. 8(a); (e) partially enlarged view of position 7 in Fig. 8(a); (f) partially enlarged view of position 8 in Fig. 8(a)
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图 9. 接头硬度分布
Fig. 9. Microhardness distributions of joint
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图 10. 冲击试样的断口形貌。(a)母材宏观形貌;(b)图10(a)中位置9的局部放大;(c)图10(a)中位置10的局部放大;(d)焊接接头1/2处宏观形貌;(e)图10(d)中位置11的局部放大;(f)图10(d)中位置12的局部放大
Fig. 10. Fracture morphologies of impact specimen. (a) Macromorphology of base material; (b) partially enlarged view of position 9 in Fig. 10(a); (c) partially enlarged view of position 10 in Fig. 10(a); (d) macromorphology of middle welding joint; (e) partially enlarged view of position 11 in Fig. 10(d); (f) partially enlarged view of position 12 in Fig. 10(d)
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表 1母材的化学成分(质量分数,%)
Table1. Chemical compositions of base material (mass fraction, %)
| Composition | C | Cr | Ni | Mo | V | Mn | Si | Al | N | Fe |
|---|
| Value | 0.20 | 0.13 | 0.89 | 0.51 | 0.001 | 1.47 | 0.17 | 0.039 | 0.014 | Bal. |
|
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表 2母材的力学性能
Table2. Mechanical properties of base material
| Property | Yield strength /MPa | Tensile strength /MPa | Elongation /% |
|---|
| Value | 624 | 743 | 18.6 |
|
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表 3拉伸试验结果
Table3. Results of tensile test
| Tensile sample No. | Yield strength /MPa | Tensile strength /MPa | Tensile fracture position |
|---|
| 1 | 562 | 684 | Base material | | 2 | 564 | 687 | Base material | | Average | 563 | 686 | |
|
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表 4冲击试验结果
Table4. Results of impact test
| Position | Absorbed energy /J | Lateral expansion /mm | Fiber fracture rate /% |
|---|
| Base material | 123 | 1.89 | 64 | | 3/4 joint | 106 | 1.53 | 62 | | 1/2 joint | 62 | 0.88 | 47 | | 1/4 joint | 72 | 1.07 | 60 |
|
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张益文, 张茂龙, 孙志远, 黄坚, 姚成武, 金鑫. 50 mm厚SA508Gr.3Cl.2钢超窄间隙激光填丝焊接头组织与性能[J]. 中国激光, 2017, 44(11): 1102006. Zhang Yiwen, Zhang Maolong, Sun Zhiyuan, Huang Jian, Yao Chengwu, Jin Xin. Microstructures and Properties of 50 mm Thick SA508Gr.3Cl.2 Steel Welding Joints by Ultra-Narrow-Gap Laser Welding with Filler Wire[J]. Chinese Journal of Lasers, 2017, 44(11): 1102006.
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