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Stressandcrackingofwelding01焊接应力与裂纹剖析
What is stresses of welding Definition:The internal stress generated by welding Classification: 焊接瞬时应力 transient?welding?stress 焊接残余应力 welding?residual?stress What is welding deformation Definition:The size change of the welding part, which is caused by welding Classification: 弹性变形 Elastic deformation 塑性变形 Plastic? deformation The root cause of welding stress and deformation 根本原因——焊接过程的加热(heat)和冷却(cooling)受到周围冷金属的拘束(constrain),不能自由膨胀(expansion)和收缩(contraction)。 non-uniform temperature field volume of different organization EXAMPLE EXAMPLE New word in text strain compression Elastic deformation Plastic? deformation/ Permanent deformation Yield point/ Yield strength Tensile strength Go on translating the text * Stress and Cracking of Welding Stresses Occurring in welding Permanent deformation Bar rigid?face Heating temperature ↑Compressive?stress ↑ 1compressive?stress??below?the?yield?point:? 2compressive?stress?exceeds?the?yield?point:? Elastic? deformation Plastic? deformation s A B *
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