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Deformation control method for large structure piece welding

A technology of large-scale structural parts and control methods, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve problems such as increasing production costs, prolonging production cycles, reducing product quality, and production efficiency, so as to reduce labor costs and improve Production efficiency, overcoming the effect of complex structure

Active Publication Date: 2004-12-15
DONGFANG TURBINE CO LTD
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AI Technical Summary

Problems solved by technology

However, for large structural parts with complex structures, the welding deformation of the structure cannot be well controlled due to the asymmetrical or large shrinkage welds that cannot shrink freely.
[0008] Since the current conventional technological measures cannot well control the welding deformation of large structural parts, the repair volume, repair rate and difficulty of repair of large structural parts are very large
It not only reduces product quality and production efficiency, but also prolongs the production cycle and increases production costs

Method used

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  • Deformation control method for large structure piece welding
  • Deformation control method for large structure piece welding
  • Deformation control method for large structure piece welding

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Embodiment Construction

[0029] Firstly, the main factors and deformation types that cause welding deformation are introduced, see Figure 1 to Figure 5 .

[0030] 1. Influence of welding stress on deformation

[0031] The stress concentration of the welded structure changes greatly, and the shape of the weld and the layout of the weld will inevitably affect the distribution of stress, so that the stress concentration changes within a large range, which has a greater impact on welding deformation and cracks. Taking the stress distribution of multi-layer weld of low carbon steel plate as an example, the analysis is carried out.

[0032] Depend on figure 1 It can be seen that after welding, a large transverse tensile stress is generated at the root of the weld, and cracks are easily generated, and at the same time, large upward varicose deformation occurs.

[0033] 2. Influence of welding joint form on deformation

[0034] The structural design of the welded joint affects the stress state and thus h...

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Abstract

The welding deformation controlling method for large structure member includes reserving shrinkage allowance of the part sizes and assembling sizes, separating large structure member into several parts to be welded together, welding after assembling of the members, integrally annealing to eliminate stress after welding, and arranging tensile ribs in the proper locations before transportation of the heat treated member. The welding adopts rich argon protection and arc welding to form bottom. The said process can control welding deformation of the large structure member effectively, shorten production period, lower labor strength and raise production efficiency.

Description

technical field [0001] The invention relates to a welding method of metal components, in particular to a method for controlling welding deformation of large structural parts, and mainly solves the welding deformation existing in welding manufacturing due to structural reasons. Background technique [0002] Large structural parts have the following characteristics: complex structure, large size, poor overall rigidity, but strong local rigidity. Due to the large number of welds and the large amount of welding, the welding deformation caused by the shrinkage of the welds during the welding process is very large; at the same time, due to the asymmetric structure of the structural part itself, it is easy to produce distortion; and after annealing, due to poor rigidity and residual Due to stress and other reasons, a large deformation will occur in the follow-up work. [0003] At present, in the welding production of large structural parts, the following methods are generally used...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/23B23K9/235
Inventor 殷安康梁钢张从平舒学芳李睿张慧曹天兰匡清华杨冬夏明星
Owner DONGFANG TURBINE CO LTD
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