[MW:19115] Re: Crane supporting beam repair

The beam will be made of a high strength steel in order to reduce the weight. In most of the cases such cracks are being caused by fatigue. It seems to me that the welds present on the first picture have bad transition at weld toe and that undercuts are present at the side of the weld which may initiate fatigue cracks. If you want to repair this beam in my opinion you need to replace a part of the beam flanges in order to distribute the stresses caused by welding activities, and a new stiffener plate need to be put in place. I would suggest to use a high frequency hammering technology, such like Pneumatic Impact Treatment in order to reduce the tensile stresses caused by welding at the surface and to introduce beneficial compressive stresses in order to increase the fatigue strength of the new welds. 

The removed part can be used for mechanical testing in order to determine the actual kind of material. I would suggest a minimum of tensile test and chemical analyses.

Best Regards,

Herman Pieper

Op maandag 28 oktober 2013 10:28:02 UTC+1 schreef hany alfy:

Dear Experts

Regarding the A/M Subject please find attached photos for Crane Manitowc support beams 

I Need your opinion what will be the grade of this beam and how to repair the cracks in these photos

Regards,

H.A

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