Fillet Welds on Lifting Lugs

By dylansegura2 Date 06-30-2019 21:46

I have some lifting lugs to weld on blind flanges and am curious as to how much fillet weld is necessary. The dimensions of the lifting lugs are 2.5" long by 3/8" thick. The heaviest blind flange is a little over 300 lbs. A single pass with 1/8" 7018 gives about a 5/16" fillet weld. Is this sufficient?

By 803056

Date 07-01-2019 00:49

Assuming the flange meets ASTM A105 carbon steel, the allowable load on a fillet weld deposited with E70 electrode is 0.9 kip per 1/16 inch leg per inch of length, based on the allowable per AWS D1.1 and AISC. While ASME may not address the specifics of the application, it wouldn't be a bad idea to use the minimum fillet size specified in AWS D1.1 based on the thickness of the flange to ensure the cooling rate is slow enough to avoid undesirable microstructure in the HAZ.

Al

By SWN1158 (***)

Date 07-01-2019 11:54

.928 x 5 = 4.64

4.64 x 2.5 = 11.6

When welded properly, one 5/16 fillet weld at 2 1/2 inches long is good for 11,600#