超声冲击对焊接结构残余应力的影响
Effect of ultrasonic impact treatment on residual stress of welded structure
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摘要: 以Q345钢结构箱型柱为对象,研究了超声冲击工艺对焊接残余应力的影响。对电渣焊和埋弧焊两种焊缝进行了超声冲击试验,其中埋弧焊焊缝采用了全覆盖冲击和焊趾冲击两种冲击工艺。残余应力测量表明,采用冲击工艺,可以在焊缝表面一定深度(小于3mm)下产生压应力,最高测得-134MPa;焊趾冲击不但使焊趾表面产生压应力,也降低了焊缝的残余应力。对非熔透埋弧焊和熔透埋弧焊焊缝的测量结果显示,在盲孔法测量的深度范围内,超声冲击可降低焊缝最大主应力约34%~55%。Abstract: The effects of ultrasonic impact treatment(UIT) on the residual stresses of welded rectangular steel(Q345) pillar were investigated.Submerged arc welding(SAW) and electroslag welded joint are processed with UIT.Two impact methods,full impact and weld toe impact,are involved for SAW joint.The test results indicated that UIT can produce compressive stress under the weld(depth less than 3 mm) and the max stress reaches-134 MPa.Weld toe UIT can reduce the residual stress of the toe and the weld.The measurement of residual stress on partial penetrating and penetrating SAW shows that,within the depth of stress measuring(drill-hole method),the UIT can reduce the maximum principal stress of the weld by 34% to 55%.
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Key words:
- welded structure /
- ultrasonic impact treatment /
- residual stress
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