X65管線鋼管閃光對(duì)焊工藝參數(shù)對(duì)焊接接頭力學(xué)性能和缺陷的影響
[Abstract]:The effect of welding process parameters on the mechanical properties of flash butt welding joint of X65 pipeline steel pipe was studied by orthogonal test. In the orthogonal test, the firing quantity of the exciting flash stage is selected, the welding current of the flash stage is stabilized, the flash speed of the flash stage is accelerated as the test factor, and the tensile strength of the welded joint is determined. Plasticity and low temperature impact toughness are used as evaluation indexes of welding process, and the optimal parameters of welding process are obtained. The metallographic analysis shows that the grain coarsening of weld zone and part of heat affected zone is caused by the high heat input, and the Weissner structure is formed, and the impact toughness of the joint is reduced. The chute hammer fracture test shows that the dense cracks in the interior and edge of the gray spot defect lead to brittle cleavage fracture of the joint. The optimized flash speed in accelerated flash stage is beneficial to reduce the defects in the weld zone and to improve the mechanical properties of the joints.
【作者單位】: 青島科技大學(xué)機(jī)電工程學(xué)院表面工程研究所;廣東省焊接技術(shù)研究所;華南理工大學(xué)機(jī)械與汽車工程學(xué)院;
【基金】:國(guó)家自然科學(xué)基金(51375173) 廣東省現(xiàn)代焊接技術(shù)重點(diǎn)實(shí)驗(yàn)室開放基金課題
【分類號(hào)】:TE973.3
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