Reliability Engineering Snapshot TM

Illustrated Case Studies in the Maintenance Reliability Engineering World of Failure Analysis, Predictive Maintenance, and Non Destructive Evaluation



Machine Design - Case No. 116: Weld Toe Profile Stress Concentration


When considering cyclic stress, it is important to minimize the adverse affects that weld profile and the weld toe have on the overall design.Putting Finishing Touches on Shell Weld

My Christmas present this year was seeing the end to a five year long endeavor. It all started well over five years ago. This month, the welds on the seventh and last stiffening ring on the rotary dryer were ground finished. I wrote a paper on this project. You can read it by going to the home page and clicking on the tab marked "ASM Tech Paper". The race was won. Patience and endurance in the reliability business are prerequisites, and they paid off. Here in this picture to the left, you see the finishing touches being put on the attachment weld. The pictures below show close ups of the attachment weld.

It is well known that there are high stresses at the weld toe. Some of the stresses are induced within the weld during the cooling process. Other stresses are induced by the notch affect created by a high toe profile. Still, other stresses are created by the fact that the parent metal surface, if not ground clean prior to welding, usually contains inferior material from the rolling process. The lower right picture says it all. The weld was blended into the stiffening ring and shell; there are no discerning marks to differentiate where the weld toe is located.

Close Up View of Finished Weld - Flush & Concave Profile Closer Up View of Shell Weld - Weld Toe Eliminated


All Pictures and Text Copyright 2002 - 2016 Contact Mr. Adler Adler Engineering LLC of Wyoming USA


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