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Anchor Bolt Welding

Anchor Bolt Welding

Anchor Bolt Welding

(OP)
I have a current project where 3" diameter ASTM F1554 Gr. 36 anchor bolts for a process tower were installed 5" too short. I am investigating the welded extension option as described in AISC DG1 and DG21. Would PWHT ever be required for F1554 Gr. 36? How can the material be investigated to ensure that the ASTM A36 composition limitations were met for the bolts supplied? What type of NDT is recommended for welding the anchor bolts?

RE: Anchor Bolt Welding

While it is possible to weld the extension necessary, I would first investigate using a coupling nut with an additional threaded section. This would eliminate most of the concerns around welding you mention.

RE: Anchor Bolt Welding

(OP)
I am looking at hex coupling nuts as the primary option and welding as the secondary. The hex coupling is a tight fit between gussets and requires mods to the tower base plate which we are checking to see if those can be done. My hope is that we can get that to work but I would like to have the welding questions answered in case we have to pursue that route.

RE: Anchor Bolt Welding

PWHT should not be required unless by contract specification. It is possible to use a specialty X-Ray Fluorescence device to determine chemical composition (and thus weldability), but it is much simpler (and cheaper) to check the material test reports or markings of the bolts in accordance with ASTM F1554. The seminar on Field Fixes by AISC has two different options for design of anchor bolt splices. The slides are available for free online from the AISC website. If NDT is required by contract, I would recommend magnetic particle testing or penetrant dye testing.

RE: Anchor Bolt Welding

I frequently see recommendations for coupling nuts. Are these manufactured to ASTM specs that would verify their suitability for use with the 36 ksi rods you are using?

I trust the Contractor is funding your efforts.

RE: Anchor Bolt Welding

All coupling nuts that I have bought commercially (from Fastenal for example) have been to ASTM spec's

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