I want to weld 2 plates of steel together flat side to flat side. One piece is 1/4" thick the other 3/16. I prefer the holes to be drilled into the 3/16 piece (the backside) so that the face you see isn't full of welds. What size holes should I drill? If I use the 1/4" thickness and the suggestion I found below I end up with minimum of 9/16". Is this correct? Should I start from the center and spiral out or from the outside and spiral in?Per AWS D1.1The minimum diameter of the hole for the plug shall be no less than the thickness of the part containing it plus 5/16(8mm) preferably rounded to the next greater odd 1/16". The maximum width shall equal the minimum width plus 1/8"(3mm) or 2-1/4 times the thickness of the member,which ever is greater.For slotted holes it is the same as above except the length of the slot shall not exceed 10 times the thickness of the part containing it.The minimum center to center spacing for plug welds shall be 4 times the diameter of the hole.The minimum center to center of slot welds (traverse direction (this way II) shall be 4 times the width of the slot. Longitudinal direction (--) shall be 2 times the length of the slot.Hope I do not confuse you with the (II) and the (--).
Reply:Spacing and size depend on the intended usage. I like min of 3/4 inch dia. Start off the 3/16 then plunge into the hole and make a fillet weld until the circumfrance is done (which will be fast) then finish filling it up.
Reply:Sounds good to me.From my line of work it was on the shop drawing. Do as the drawings stated. Here in this group most are not working from drawings. Dave
Originally Posted by MISSING LINK
Spacing and size depend on the intended usage. I like min of 3/4 inch dia. Start off the 3/16 then plunge into the hole and make a fillet weld until the circumfrance is done (which will be fast) then finish filling it up.
Reply:I never knew there was an AWS standard for plug welds. That's good to know.I've always sized the hole according to the thinnest steel. Thinner the steel, larger the hole. If your strength is limited by the thinner material, it only makes sense to size the weld so that the greatest length of weld will fall on the thin stuff. Large hole, more weld length. Remember............you're really only relying on that thin edge to hold things together.
11ga tubing to 3/8 bar stock. This arm is responsible for carrying half the load on a 1 ton cherry picker. So, you really have to think about what that thin edge is carrying. Something like this, I don't get fancy,, nor do I close in the circle with additional weld................there's no reason to, you don't gain any strength.
发表于 2021-12-19 15:51:31
