The specimens were machined such that plug weld was centered on the width of the specimen . 對試件進行了機加工以使塞焊焊縫位于試件寬度中間。
No spalled paint exists at the plug weld and for a short distance each side of the plug welds . 在塞焊焊縫處及塞焊周圍距離內(nèi)無細漆碎屑存在。
Close examination of the plug welds showed the existence of herringbone patterns near the slag and voids in welds . 對塞焊焊縫的詳細檢查表明在焊渣及氣孔附近,焊縫中存在著人字型裂紋。
Thus the fracture likely initiated from fatigue sharpened cracks originating from slag and void in the plug welds . 因此,斷裂可能是由于從塞焊焊縫內(nèi)的焊渣和氣孔外形成的尖銳的疲勞裂紋而產(chǎn)生的。
Development and key problem of friction plug welding 摩擦塞焊研發(fā)與關(guān)鍵問題