Design and Optimization of Liner TIG Welding Gun for Nuclear Heat Transfer Tube with Small Diameter

doi:10.12141/j.issn.1000-565X.220754

Abstract

Abstract:

As China’s nuclear industry enters the third 30 years of development, the maintenance need for nuclear equipment is becoming increasingly urgent. The internal structure of the nuclear steam generator is complex, and the key structure, namely the heat transfer tube, has the restrictions like small diameter, long pipeline and difficult disassembly and installation, which make traditional repair methods extremely difficult in implementation. In order to solve the problem of corrosion damage of small-diameter nuclear heat transfer tube due to long-term high temperature and high pressure condition, an all-position automatic TIG welding gun for liner repair was designed in this paper, and the gun reliability verification and welding repair test were carried out. Firstly, the overall structure design of the welding gun was presented, and the advantages of the designed welding gun comparing with the traditional tungsten electrode TIG welding gun were described. Next, the design and verification of the welding gun transmission system with small size and high space utilization were completed. Then, the stiffness of the key part of the welding gun, namely the conductive shaft, was modelled, analyzed and calculated, and the reliability of the theoretical model was verified by finite element solution. On this basis, an optimization method of the welding gun structure was proposed. Moreover, the field test of deflection and the welding test were carried out, finding that the stiffness of the conductive shaft satisfies the field welding conditions. Finally, linear regression equations and deflection correction formulas were used to quantitatively predict the deflection of the welding gun, and the results verify the rationality of the designed structure. Welding tests results show that the rotation speed of the transmission system is stable and controllable in working condition of welding gun, and the welding seam is well formed. The developed liner welding gun can satisfy the requirements of liner welding repair of the stainless-steel heat transfer tube inside the nuclear steam generator.

Key words: small-diameter heat transfer tube, welding gun, stiffness modelling, finite element, liner welding

CLC Number:

TH122

WANG Zhenmin, XIE Huimin, LI Xuyan, et al.. Design and Optimization of Liner TIG Welding Gun for Nuclear Heat Transfer Tube with Small Diameter[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(7): 1-11.

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参数	取值		取值
输入电压/V	24（DC）	额定转矩/（N·m）	6
空载转速/（r·min^-1）	17.4	瞬间允许扭矩/（N·m）	9
空载电流/A	0.5	减速比	721∶1
额定转速/（r·min^-1）	14.5	工作效率/%	85
额定电流/A	1.7

参数	符号	取值
齿间载荷分配系数	K_F	1.3
电机输出转矩/（N·m）	T₁	14
齿宽系数	φ_d	1
总传动比	u	2.9
区域系数	Z_H	2.5
材料弹性系数/MPa	Z_E	189.8
接触疲劳强度重合度系数	Z_ε	0.873
接触疲劳强度许用应力/MPa	σ_H	523

参数	符号	取值		符号	取值
齿间载荷分配系数	K_F	1.3	重合度系数	Y_ε	0.629
电机输出转矩/（N·m）	T₁	14.5	应力修正系数	Y_Sα	1.58
齿宽系数	φ_d	1	齿轮齿数	z	18
齿形系数	Y_Fα	2.65	模数	m	1

构件	材料	密度ρ/（kg·m^-3）	弹性模量E/GPa	泊松比	屈服强度σ/MPa	外径R/mm	内径r/mm
导电轴	黄铜	8 500	106	0.324	240	11	3
钨极导电杆	铜	8 900	119	0.326	68.6	12.5	2.5

挠度	取值		取值
w_B /mm	9.002	θ_B /rad	1.47×10^-2
w_C₀/mm	1.326	θ_CB /rad	9.74×10^-5
w_CB /mm	5.0×10^-4	θ_C /rad	1.48×10^-2
w_C /mm	10.328