Padeye Welding Procedure 1

[Kirkwood00007]

I have a skid that I am trying to weld padeyes on, and I am looking for some references to find the proper welding procedure. Any ideas would be helpful.

 

[metengr]

Kirkwood00007;
The first order of business is to know the materials of construction. Once you know this information, further information can be provided.

 

[SJones]

Followed by deciding upon an appropriate construction code.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[Kirkwood00007]

The Skid is square 2" tubing 1/4" thick. I have designed the skid with (4) 1.125" thick padeyes capable of supporting 13.5 metric tons. I just don't know if they should be attached by full penetration welds, what the best method of attachment should be. The skid should not weigh more than 4000#'s.

 

[Vestveit]

It would be conservative to go for the full pen welds. Full pen welds will match the strength of your padeyes, provided you require a qualified welding procedure for these welds. If the padeyes are only subjected to low fatigue utilisation then full pen welds will be a waste of time in production, and it might be more rational to go for reinforced partial pen welds. Less welding means less distortion and residual stresses.

 

[metengr]

I would not recommend full penetration welds. This is only 1/4" thick base material that you are joining to each pad eye. You need to size the welds based on the lesser of the two thicknesses being joined, and design load using a reasonable safety factor.

 

[Ballbearing1]

I agree with metengr regarding the thickness and the size of the weld.
I am definitely not an engineer but should you not have some form of compensating plate for the padeyes to weld on to.?
Regards,
BB

 

[racookpe1978]

I'd actually recommend using through (bolted-on) padeyes.

Be more flexible for the rigging crew, and the padeye strenth/load is carried by the certified metal (not welded) and their nuts/washers.

 

[boo1]

1.125" thick padeyes are to thick for the 0.25 base metal. Consider using 3/8 thick to closer match the tubing. Use a SF of 5, assume three pick up points.

In the US the following may help guide you:
ASME BTH-1-2008 Design of Below the Hook Lifting Devices, Chapter 3
ASME B30.20a-2003 Structual and Mechanical Lifting devices. Section 20-1.2.2 Construction
CMAA crane requirements
AASHO 1.6.17
Steel Construction Manual-AISC
Occupational Safety and Health Administration (OSHA) 29 CFR standard 1926.753(e)(2) and 1926.251
American Society of Testing and Materials Specifications A391
Naval Facility Command NAVFAC-307
American National Standards Institute, "Below The Hook Lifting Devices"