Finite element simulation of residual stresses and their measurement by contour method

Residual stress prediction in submerged arc welded spiral pipes

It is known that some problems commonly arise when welding dissimilar metals, especially because it is more difficult to join dissimilar metals than similar metals. Therefore, to join 20/0Cr18Ni9 dissimilar plate with good quality, this paper based on the finite element simulation software Simufact Welding, the residual stress field and deformation results for 6-mm-thick 20/0Cr18Ni9 plates were examined by combining numerical simulation with experimental verification and performing an orthogonal experiment of post-weld heat treatment parameters. The experimental results show that the residual stress of each model is significantly reduced, the reduction of lateral residual stress is greater than that of longitudinal residual stress, the stress reduction of the 20 steel side is significantly larger than that of the 0Cr18Ni9 side, but the deformation of each model was small after heat treatment. It is found that the heat treatment temperature has the greatest effect on the reduction of residual stress and deformation, and the reduction of residual stress will also be affected by the plasticity of the material. Moreover, the material of the weld should be selected as far as possible from the properties of the base metal.

Effect of post-weld heat treatment on the residual stress and deformation of 20/0Cr18Ni9 dissimilar metal welded joint by experiments and simulations

https://link.springer.com/content/pdf/10.1007%2Fs12598-013-0036-y.pdf

Microstructure and mechanical performances of CGHAZ for oil tank steel during high heat input welding

Pipelines used for the petrochemical, energy, and other industries contain 20 steel and 0Cr18Ni9. This paper based on the finite element simulation software Simufact Welding, the residual stress fi...

Effect of different welding parameters on residual stress and deformation of 20/0Cr18Ni9 dissimilar metal arc-welding joint

The distribution of the residual stress in the weld joint of HQ130 grade high strength steel was investigated by means of finite element method (FEM) using ANSYS software. Welding was carried out using gas shielded arc welding with a heat input of 16 kJ/cm. The FEM analysis on the weld joint reveals that there is a stress gradient around the fusion zone of weld joint. The instantaneous residual stress on the weld surface goes up to 800 ∼ 1000 MPa and it is 500 ∼ 600 MPa, below the weld. The stress gradient near the fusion zone is higher than any other location in the surrounding area. This is attributed as one of the significant reasons for the development of cold cracks at the fusion zone in the high strength steel. In order to avoid such welding cracks, the thermal stress in the weld joint has to be minimized by controlling the weld heat input.

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Finite element analysis of residual stress in the welded zone of a high strength steel

Three solutions to deal with the phase changes and its latent heat have been discussed in numerical analysis of gas tungsten arc welding processes for stainless steel sheet.The fraction of liquid method has been manipulated in detail based on the phenomena of physics,and the algorithm in programming has been presented.Calculated results show that the predicted weld pool geometry agrees much better with the experimental measurement while taking account of latent heat of phase change.

Solutions for latent heat of phase change in numerical analysis of arc welding

Carbon extraction replica analysis was employed to measure the quantities and size distributions of particles in Ti microalboyed steel and its simu]ated CGHAZ to reveal the response behavior of second phase particle to the welding thermal cycle And the microstmcture and impact toughness of CGHAZs in Ti microalloyed steel and a kind of HSLA steel with similar chemical content and manufacture process were investigated with OM , TEM and series charpy impact test The results show that a large amount of small-size TiN particles exist in the Ti microalboyed steel During the weld thermal cycling, TiN particles prohibit the original austenite grain from coarsening, prevent the formation of coarse upper bainite , accelerate the formation of acicular ferrite, and promote the decomposition of M-A constituent into ferrite and cementite, thus improve the toughness of CGHAZ in HSIA steel remarkably With the t515 increasing from 16s to 120 a, the toughness of CGHAZ in Ti microalloyed steel increased because the secondary microstructure of CGHAZ changes from upper bainite to acicular ferrite and the austenite grain size coarsening is not seriousated CGHAZ to reveal the response behavior of second phase particle to the welding thermal cycle And the microstmcture and impact toughness of CGHAZs in Ti microalloyed steel and a kind of HSLA steel with similar chemical content and manufacture process were investigated with OM , TEM and series charpy impact test The results show that a large amount of small-size TiN particles exist in the Ti microalboyed steel During the weld thermal cycling, TiN particles prohibit the original austenite grain from coarsening, prevent the formation of coarse upper bainite , accelerate the formation of acicular ferrite, and promote the decomposition of M-A constituent into ferrite and cementite, thus improve the toughness of CGHAZ in HSIA steel remarkably With the t515 increasing from 16s to 120 a, the toughness of CGHAZ in Ti microalloyed steel increased because the secondary microstructure of CGHAZ changes from upper bainite to acicular ferrite and the austenite grain size coarsening is not serious

Chen Maoai

Papers

Finite element analysis of residual stress in the welded zone of a high strength steel

Solutions for latent heat of phase change in numerical analysis of arc welding

Effect of Second Phase Partlde on Mlcrostructure and Toughness of CGHAZ in HSLA