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INFLUENCE OF WELDING SEQUENCE
ON WELDING STRESS OF T JOINT
ZHANG Liguo1 JI Shude1 FANG Hongyuan2 LIU Xuesong2
(1. Academy of Astronautical Technology, Shenyang Institute of Aeronautical Engineering, Shenyang 110034;
2. State Key Laboratory of Advanced Welding
Production Technology, Harbin Institute of
Technology, Harbin 150001
)
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Abstract: In
order to get the optimizing scheme of T type joint’s welding sequence, the effect of welding sequence on welding residual stress field of T
joint is simulated from the view of multibead welding, subsection
welding and multilayer welding on the basis of ensuring reasonable
welding heat source and establishing the finite model. For the
multibead welding, the residual tensile stress appears in the weld and
nearby while the maximum value appears in the weld. Moreover, the method
of the different welding direction between adjacent beads during the
multibead welding makes the residual tensile stress peak value minimum.
The subsection welding in which the prior welding section is the two end
section and the latter welding section is the middle section not only
can increase the low stress region of weld, but also can effectively
decrease welding residual stress of the prior welding section. Moreover, the decreasing effect of subsection welding is related to the welding
direction of the latter welding section and the distance between one
point of the prior welding section and the end of the latter section. In
the multilayer welding process, the method of symmetry welding gets the
minimum residual tensile stress.
Key words: T joint Subsection welding
Welding sequence
Stress field
CLC No: TG156
Received 20060220, received in revised form 20060920
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