Fillet welds
Fillet welds
(OP)
Can anyone direct me on finding the " minimum multiple pass fillet weld used in construction? Lost.....
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RE: Fillet welds
It depends upon the welding process and the rod or wire size, amongst other variables. But, a 5/16th fillet is about the max. single pass fillet that can be made soundly and practically. Draw a full size, standing web pl. on top of a flange pl. Then show full size 1/4" and 5/16", 45̊ triangles as the fillet welds, the weld should be slightly convex to the outside. Anything larger than this is most likely a multi-pass weld made up of weld nuggets about the size of the 1/4" weld, or a little smaller.
Get yourself a couple good weld design books. Lincoln Electric has some very good weld design books by a guy name Omer W. Blodgett “Design of Welded Structures” and “Design of Weldments.” Get them, they are the best book buy you’ll ever make. Look over their other books too.
RE: Fillet welds
Practically, a fat 3/16" or nominal 1/4" multi-pass fillet are the smallest that can be made. Using Tig - GTAW - really skilled guys could make an 1/8" multipass weld, but now you are in the realm of making minatures and jewelry.
I demand multi-pass welds on all pressure-boundary welds, and I usually see 1/4" to 5/16" fillets.
RE: Fillet welds
RE: Fillet welds
Best regards - Al
RE: Fillet welds
Interestingly, just this afternoon I was at a baseball game, and as I was walking down the stadium exit ramp I looked up at the structural welds used to connect the caps and webs of the huge cantilevered steel I-beams supporting the upper decks. These fillet welds were made back in the early 1960's, and the beam sections were probably 1"-2" thick. I could see that at least 3 staggered passes were used for most welds, and I could see the locations along the welds where the welder had to stop and change electrodes. The full width of the fillet welds looked to be at least 1", and each pass looked to be around 1/2" wide.
RE: Fillet welds
RE: Fillet welds
One qualifies the WPS for fillet welds when the conditions of prequalification are not met. In that case, the contractor must qualify a WPS for fillet welds. Generally, the welding parameters are established by welding the largest single pass fillet weld and a second sample is welded depositing the smallest multiple pass fillet weld. The is a practical limit to the sizes (both largest and smallest) based on the size of the filler metal used. Once the parameters required to deposit suitable welds are established, i.e., voltage, amperage, travel speed, wire feed speed, etc., the mechanical properties are verified by welding a butt joint utilizing a CJP groove weld. The groove welded assembly is then subjected to VT, volumetric NDE, reduced section tensile testing, and guided bend tests. The essential variables listed in D1.X are reqorded on the PQR and become the basis of the "qualified WPS."
Best regards - Al
RE: Fillet welds