Depending on the age of the Crane in my opinion it can be S355, S460 or S690 material. That is why I suggest to execute some mechanical tests on the material.
Met vriendelijke groeten / Best Regards,
Herman Pieper
QA-QC Inspector / IWI-C Welding Inspector / IWT / Materials Expert
Job van der Havestraat 6
8384 DB, Wilhelminaoord
Cell: +31 6 51691215
Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens hany alfy
Verzonden: woensdag 30 oktober 2013 10:06
Aan: materials-welding@googlegroups.com
Onderwerp: Re: [MW:19123] Re: Crane supporting beam repair
Dear
High tensile steel you mean S355 or you meant another type ?
can you please specify the specification of the said Grade?
Regards,
H.A
On Tuesday, October 29, 2013 4:39 PM, hpi001 <info@pieper-qsi.nl> wrote:
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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