Plate Girder

[Zambo]

We need to erect a crane beam. The required size isn't available on the local market so we plan to use a "built up beam" (I would normally refer to this as a plate girder). Anyone got any advice on NDT, the welds will be fillet welds so I think the best option is 100% MPI. Are any other tests required - the steel will be grade 43A i.e mild steel plate.

 

[Qshake]

Since the girder will be used for moving loads and subject to fatigue, you will need to notch toughness requirements for the tesion plates.

Regards,
Qshake

Eng-Tips Forums:Real Solutions for Real Problems Really Quick.

 

[gtaw]

The responses for the thread 50ksi W21x44 over 60' long Welding 2 together? under the heading "welding, bonding, and fastener engineering" should provide some good ideas.

Best regards - Al

 

[Dinosaur]

You need to ask for an AISC certified shop in the contract, and all welders certified in the welding processes used, which may be flat and horizontal. I would get 100% visual inspection of the fillet welds and then Mag Particle any suspect areas. If you permit ASTM designations for your steels then ask for the supplemental test for Charpy V-Notch toughness. You also want to make sure the carbon equivalence is below the value needed for your steel before welding, and this will require full mill certs on the base material. We use CWIs to do independent QA on shops for all our significant jobs.

 

[dik]

If fatigue's an issue, then continuous fillet welds are in order... Dik

 

[HgTX]

If you're going to ask for Charpy testing, you need to have Charpy results in mind. Consider the ASTM A 709 requirements for non-fracture-critical applications.

Hg


Eng-Tips policies: faq731-376

 

[unclesyd]

In the US there are other regulations and specifications that should be followed for any type lifting device. I have not idea where the jurisdiction begins and ends under the present rules.

At one time it was essentially ANSI/OSHA now just a cursory look it looks like the MHIA, mainly CMAA has gotten involved.

http://www.mhia.org/psc/PSC_Products_Cranes_TechQuestions.cfm