梨形溶込みビード割れの研究

概要

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A pear-shaped bead crack and the segregations around it were investigated. The best coefficient and limit value to the cracking were also studied. Main results obtained are as follows. (a) Pear-shaped bead crack is a solidification crack at last solidification point (L. S. P.), and when restraint stresses work on this, the crack is enlarged reaching the bead surface. (2) The segregations are recognized in the crack. (3) As the coefficients of pear-shaped bead crack, there are P/W, (P : bead depth, W : surface bead width), Wm/W (Wm : max, bead width), and A/P, (A : area of weld metal). Among these three, P/W has the best relations to the occurrence of the crack. (4) When the value of P/W is more than 1.3,the pear-shaped bead crack is liable to occure very often. (5) The occurrence of the crack depends on the coefficient value of bead shape, P/W or Wm/W. (6) It is clear that the pear-shaped bead crack is caused by the L. S. P. being enclosed in a bead.
社団法人溶接学会の論文
1980-01-05