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Welding method with cold source and displacement controlled load along with welding

A technology of displacement control and welding method, which is applied in the direction of welding equipment, welding equipment, auxiliary welding equipment, etc., and can solve the problems of unsatisfactory local heat treatment effect of large structural parts, failure to achieve the effect, reheat cracks, etc.

Active Publication Date: 2021-01-29
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the above methods, the effect of post-weld heat treatment is the best, but it is only suitable for the overall heat treatment of small structural parts, and the local heat treatment effect of large structural parts is still unsatisfactory.
Moreover, post-weld heat treatment consumes a lot of energy. If the heat treatment temperature and time are not properly controlled, it will lead to embrittlement and even reheat cracks.
If the prediction is inaccurate in the pre-welding measures, the effect will not be achieved, and if the post-welding measures are not timely, it will not help

Method used

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  • Welding method with cold source and displacement controlled load along with welding

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Embodiment Construction

[0022] Such as figure 1 , figure 2 The length L=0.2m, the width B=0.15m, the thickness H=0.004m, the length L of the welding seam shown in the weldment 1 w =0.2m, the length of the range of cold source L c =0.2m, width B c =0.04m, welding speed v w =0.003m / s, welding current I=180A, welding voltage U=27V, the maximum allowable temperature drop of the steel plate within the scope of the cold source is ΔT c =20℃, the power of cold source is P _ =1000w. Steel specific heat capacity c=460J / (kg℃), density ρ=7850kg / m 3 , Expansion coefficient α=1.2E-5 / ℃, steel plate surface convective heat transfer coefficient h=10W / (m 2 ℃).

[0023] The inventive method comprises the following concrete steps:

[0024] 1. Calculation of relevant parameters: the displacement growth rate of the tensile load perpendicular to the weld is , the displacement growth rate of the tensile load parallel to the weld is . The unloading time of mechanical tensile displacement load is about The di...

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Abstract

The invention discloses a welding method for loading a cold source with welding and controlling load with displacement. The method includes: applying a cold source with a certain power to other parts of the weldment before and during the application of the welding heat source; if the power of the cold source is not enough , then a displacement-controlled mechanical tensile load is applied simultaneously in the lengthwise direction of the weld and in the direction perpendicular to the weld. This method is that while the welding heat source acts, a certain power cold source acts on other parts of the weldment. If the total deformation caused by the cooling contraction in this area can be equal to the total deformation of the free thermal expansion of the heating part, then the heating The expansion of the part is not hindered, the stress will be zero, and no plastic deformation will occur. If the power of the cold source is limited, the total deformation caused by the cooling contraction is less than the total deformation of the free thermal expansion of the heating part, and a mechanical tensile load can be applied around the weldment at the same time to generate a certain stretch in the entire weldment or locally Elastic deformation to compensate or counteract the free thermal expansion deformation of a part of the heating part. In practice, welding with low stress and no plastic deformation can be realized, the compressive stress in the weldment can be reduced, and the instability and deformation of the thin plate can be avoided.

Description

[0001] 1. Technical field [0002] The invention belongs to the technical field of welding, and in particular relates to a welding method for loading a cold source along with welding and controlling load with displacement. [0003] 2. Background technology [0004] The welded structure will generate high stress during welding, and the welded structure is prone to large deformation and even cracks. Welding stress poses a great threat to the safety of structures. According to the sequence relative to the welding process, the existing measures to control the stress of welded structures can be divided into three modes: before welding, during welding and after welding. Pre-welding measures include preheating, pre-stretching along the length of the weld, reverse deformation, etc.; welding measures include welding rolling, point-by-point extrusion, welding hammering, temperature difference stretching, LSND, and welding rotary extrusion etc.; post-weld measures include post-weld heat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/02B23K37/00
CPCB23K31/02B23K37/003
Inventor 管建军钟宏远赵艳宋天民陈怀宁刘峰蒋应田
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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