Effect of Heat Inputs on Microstructure and Properties of QP1180 Steel Laser Welded Joints

Tiancai Zhu; Xiaonan Wang; Wengang Chen; Zengrong Hu; Yong Xie; Bin Yang; Qiuxiang Yu

doi:10.3788/LOP57.051406

Journals >Laser & Optoelectronics Progress >Volume 57 >Issue 5 >Page 051406 > Article

Laser & Optoelectronics Progress
Vol. 57, Issue 5, 051406 (2020)

Effect of Heat Inputs on Microstructure and Properties of QP1180 Steel Laser Welded Joints

Tiancai Zhu^1、2, Xiaonan Wang^2、*, Wengang Chen¹, Zengrong Hu², Yong Xie¹, Bin Yang², and Qiuxiang Yu^2、3

Author Affiliations

¹School of Machinery and Traffic, Southwest Forestry University, Kunming, Yunnan 650224, China

²School of Iron and Steel, Soochow University, Suzhou, Jiangsu 215021, China

³School of Metallurgical Engineering, Anhui University of Technology, Maanshan, Anhui 243032, China

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DOI: 10.3788/LOP57.051406 Cite this Article Set citation alerts

Tiancai Zhu, Xiaonan Wang, Wengang Chen, Zengrong Hu, Yong Xie, Bin Yang, Qiuxiang Yu. Effect of Heat Inputs on Microstructure and Properties of QP1180 Steel Laser Welded Joints[J]. Laser & Optoelectronics Progress, 2020, 57(5): 051406 Copy Citation Text

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Fig. 1. Microstructure SEM images of QP1180 high strength steel. (a) Low magnification of BM; (b) I area enlargement

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Fig. 2. XRD pattern of QP1180 high strength steel

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Fig. 3. Schematic of tailored blank laser welding

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Fig. 10. Photos of base metal and weld joints after Erichsen test. (a) BM; (b) 21 J/mm; (c) 29 J/mm; (d) 36 J/mm

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Element	C	Si	Mn	Nb	Ti	V	S	P	Fe
Mass fraction /%	0.240	1.500	2.500	0.530	0.010	0.100	≤0.010	≤0.005	Bal.

Table 1. Chemical composition of QP1180 high strength steel

Parameter	Yield strength /MPa	Tensile strength /MPa	Elongation /%	Hardness /HV
Value	1020	1160	21.9	~385

Table 2. Mechanical properties of QP1180 high strength steel

P /kW	v /(m·mi $\begin{matrix} {n^{-}}^{1} \end{matrix}$ )	E /(J·mm^-1)	Protective gas
1.0		14
1.5	4.2	21	99.9% Ar
2.0		29
2.5		36

Table 3. Welding parameters of experimental steel

Heat input /(J·mm^-1)	Width of softenedzone /μm	Minimumhardness /HV
21	150	357
29	200	354
36	300	346

Table 4. Width and minimal hardness of softened zone in full-penetration weld joints

Heat input /(J·mm^-1)	YS/MPa	TS/MPa	Elongation /%	Fracture position
14	310	327	4.6	WS
21	1015	1150	19.3
29	1008	1160	18.2	BM
36	1014	1140	20.1

Table 5. Tensile properties of welded joints

Heat input /(J·mm^-1)	Erichsen value /mm	Crack initiation location
14	3.5(52%)
21	5.1(76%)	FZ
29	4.9(73%)	FZ
36	4.7(70%)	FZ

Table 6. Results of Erichsen test

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