PSI - Issue 5

Zuheir Barsoum et al. / Procedia Structural Integrity 5 (2017) 1401–1408 Zuheir Barsoum / Structural Integrity Procedia 00 (2017) 000 – 000

1406

6

experiments and FEA shows that a joint with an under-matched filler material is more ductile in comparison to joints with over-matched and matched filler. The effect of weld metal penetration ratio on the ultimate strength capacity can also be seen. Keeping 75% penetration ratio as a reference, for a joint with an under-matched filler material, the ultimate strength capacity of the joint increases by 63% with increase of the penetration ratio to 100%, while a decrease in penetration ratio to 50% decrease the ultimate strength capacity by 28%. The joint with an over-matched filler material shows that with full penetration the ultimate strength capacity is increased by 16% while a decrease in penetration ratio the capacity decrease by 20%. Thus, the weld metal penetration ratio has more influence on the ultimate strength capacity of the joint with under-match filler material. It is also observed that the capacity is dependent on the joint preparation because the angle of critical plane of the weld to the direction of applied loading changes with a change in joint preparation.

Fig 6. Comparison of ultimate strength capacity for fillet welds (a) under-matching (b) over-matching filler material.