Main factors affecting welding residual stress

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Main factors affecting welding residual stress

the main cause of welding residual stress is caused by uneven heating of weldments during welding. Taking the fusion welding method as an example, the main factors affecting the residual stress are reflected in the following two aspects:

1, the influence of thermal and mechanical properties of materials. The average value of the thermal properties of some common metal materials in the given temperature T range is shown in the table below. Thermal expansion coefficient α And thermal conductivity λ It is an important parameter to determine the thermal stress-strain of welding. Coefficient of thermal expansion α、 thermal conductivity λ, Specific heat capacity C, density Q, heat stew s are the main physical parameters that affect the distribution of unplasticized polyvinyl chloride (PVC-U) pipes for water supply at welding temperature 141

colorful material name of material color α/ K-1 λ/W/m K T/K

low carbon steel 12~16 0.050~0.060 500~600

low alloy steel 16.5~17 0.037~0.043 500~600

aluminum alloy 2 wear particles deposited on Ferrograph 3~27 0.27 300~350

austenitic chromium steel increases the test bench by 5 ⑴ 0mm16~20 0.026~0.034 600~620

titanium alloy 8.5 0.16 700~800

2, different.Influence of type of welding heat source. The decisive factor of producing welding stress is the heat input during welding. The type of welding heat source, the change speed of heat source, the distribution of heat energy density, and the shape and size of weldment all affect the distribution of temperature field caused by heat source, thus affecting the distribution law of welding residual stress

welding residual stress has an impact on the fatigue performance and stable bearing capacity of the structure. If you want to know about the detection and elimination of welding residual stress, please call Nanjing Juhang Technology Co., Ltd

source: Nanjing Juhang

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