Microstructure and Mechanical Properties of QP1180 High-Strength Steel Welded Joints Using Oscillation Scanning

Wenhu Lin; Yue Wu; Fang Li; Xueming Hua

doi:10.3788/CJL202249.2202015

Chinese Journal of Lasers, Volume. 49, Issue 22, 2202015(2022)

Microstructure and Mechanical Properties of QP1180 High-Strength Steel Welded Joints Using Oscillation Scanning

Wenhu Lin^1、*, Yue Wu², Fang Li³, and Xueming Hua³

Author Affiliations

¹Center for Adaptive System Engineering, School of Creativity and Art, ShanghaiTech University, Shanghai 201210, China

²School of Materials Science, Shanghai Dianji University, Shanghai 201306, China

³Shanghai Key Laboratory of Laser Processing and Material Modification, Shanghai Jiao Tong University, Shanghai 200240, China

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Figures & Tables(11)

Fig. 1. Diagram of galvanometer scanning mode

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Fig. 2. Weld formations of QP1180 high-strength steel welded joints under different linear scanning rotation angles. (a1)(a2) 90°；(b1)(b2) 45°；(c1)(c2) 0°

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Fig. 3. Microstructures of QP1180 high-strength steel welded joints when linear scanning rotation angle is 45°. (a) Middle of FZ; (b) edge of FZ; (c) CGHAZ; (d) FGHAZ; (e) ICHAZ; (f) SCHAZ

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Fig. 4. Band contrast maps at different zones of QP1180 high-strength steel welded joints when linear scanning rotation angle is 45°. (a) Middle of FZ; (b) edge of FZ; (c) CGHAZ; (d) FGHAZ; (e) ICHAZ; (f) SCHAZ

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Fig. 5. Grain orientation maps at different zones of QP1180 high-strength steel welded joints when linear scanning rotation angle is 45°. (a) Middle of FZ; (b) edge of FZ; (c) CGHAZ; (d) FGHAZ; (e) ICHAZ; (f) SCHAZ

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Fig. 6. Microhardness distributions of QP1180 high-strength steel welded joints. (a) Microhardness distribution curves; positions of hardness test points when linear scanning rotation angle is (b) 90°，(c) 45°，(d) 0°，respectively

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Fig. 7. Stress－strain curves of QP1180 high-strength steel welded joints under different linear scanning rotation angles

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$Tensile fracture morphologies of QP1180 high-strength steel welded joints under different linear scanning rotation angles. (a)(d)(g) 90°；(b)(e)(h) 45°；(c)(f) (i) 0°$

Fig. 8. Tensile fracture morphologies of QP1180 high-strength steel welded joints under different linear scanning rotation angles. (a)(d)(g) 90°；(b)(e)(h) 45°；(c)(f) (i) 0°

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Table 1. Chemical compositions of QP1180 steel
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Table 1. Chemical compositions of QP1180 steel
Composition C Si Mn P S Al
Mass fraction /% 0.1801 1.6550 2.6620 0.0074 0.0006 0.0323

Table 2. Effect of linear scanning rotation angle on weld size
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Table 2. Effect of linear scanning rotation angle on weld size
Linear scanning rotation angle /(°) W_FZ/μm D₀/μm W_CG+FG/μm
90 1788 2428 285
45 1716 2594 440
0 1394 2219 412

Table 3. Mechanical properties of QP1180 high-strength steel welded joint

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Table 3. Mechanical properties of QP1180 high-strength steel welded joint

Linear scanning rotation angle /(°)	Yielding strength /MPa	Tensile strength /MPa	Uniform elongation /%	Total elongation /%
90	1020±33	1094±0.7	5.7±1.0	10.0±1.9
45	1004±51	1271±34	7.0±0.2	12.9±0.4
0	1019±27	1245±22	8.2±0.2	13.5±0.1
Welded joint in Ref.[1]	1021	1196	－	14.5

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Wenhu Lin, Yue Wu, Fang Li, Xueming Hua. Microstructure and Mechanical Properties of QP1180 High-Strength Steel Welded Joints Using Oscillation Scanning[J]. Chinese Journal of Lasers, 2022, 49(22): 2202015

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