The Influence of the Weld Width on Fracture Behaviour of the Heterogeneous Welded Joint

Abstract

Since welded constructions are widely used in engineering, a certain flaws in welded joints may occur either in process of welding or in exploitation period. Easiest way to prolong working life of such welded construction is to repair welded joint to eliminate possibility of construction failure. Process of repair welding usually gives heterogeneous welded joints because during process of repair additional material is introduced into welded joint, resulting in heterogeneity from the presence of materials in welded joint point of view. Such difference in materials usually results in yield strength difference between materials, represented with mismatch ratio, and it is commonly present in welds where high strength low-alloyed (HSLA) steels were welded. Since I butt welded joints are very common in welding, a systematic investigation of such welds is performed and presented in this paper. Therefore in this investigation the influence of present material in heterogeneous weld and geometry of weld is investigated in context of fracture resistance of welded joint represented as yield load solutions in the first place. A flaw in form of crack was implemented in such heterogeneous weld and using finite element method yield load solutions for different combinations of weld geometry and material strength are obtained and presented in form of diagrams.

Fatigue properties of weld joint of steel sheets treated by PLASOX process

“…Character of final fracture was also transcrystalline with pitting morphology. Further research should also involve the influence of weld width and shape on fracture behaviour [9].…”

Yield Load Solutions for SE(B) Fracture Toughness Specimen with I-Shaped Heterogeneous Weld

“…Yield load solutions are available for a limited number of strength mismatch configurations for over-matched and under-matched welds [ 17 , 18 , 19 , 20 ], but only very limited and partial solutions in situations where additional heterogeneity due to repair weld metal is present in another level of the strength mismatch [ 21 , 22 ]. Therefore, this research aims to extend the existing yield load solutions to I-shaped heterogeneous weld solutions in order to gain insight into the fracture behavior of the repaired weld and open the possibility of applying structural assessment procedures for repair welds.…”

Structural Integrity Assessment of Welded Pipeline Designed with Reduced Safety

“…In any case, due to HSLA steel sensitivity to cracking, so-called undermatching effect is a preferable option for welded joints since the overmatching would cause additional welding problems. The undermatching effect, as well as all other constraint effects, requires essentially different approach to welded structure analysis, [1][2][3][4][5][6][7][8][9][10][11], since plastic strain in such weld metal is inevitable, [12,13].…”