Stitch weld

admin

How do you lay out a 2-8 stitch weld on a piece of plate that is 47-1/2" wide. The boss told me that he wanted 2" of weld at the beginning and 2" at the end, but the centers didn't come out to be 8". Center to center it figured out to be 7-5/8" to make the 2" welds evenly spaced across the plate. I understand how to lay out spindles for a porch railing but this is different because you don't start with a space and the welds are measured at the center.
Reply:Soapstone and an educated stick ...

Backed my CATMA over your CARMA oops clusmy me  

What would SATAN do ??

Miller Trailblazer 302 AirPakMiller Digital Elite  Optrel Welding HatArcair K4000Suitcase 12RC / 12 VSHypertherm PM-45Rage 3 sawRusty old Truck
Reply:

Originally Posted by Ksnyder

How do you lay out a 2-8 stitch weld on a piece of plate that is 47-1/2" wide. The boss told me that he wanted 2" of weld at the beginning and 2" at the end, but the centers didn't come out to be 8". Center to center it figured out to be 7-5/8" to make the 2" welds evenly spaced across the plate. I understand how to lay out spindles for a porch railing but this is different because you don't start with a space and the welds are measured at the center.
Reply:I didn't explain myself correctly, the boss did the lay out on the first piece we worked on I just copied what he did on the next one. He gave me a quick explanation but he rattled it off so fast.
Reply:3/8" isn't that much, on a 47 1/2" long plate you're getting 7 or 8 welds 2" long, so whatever it is that you're making that's going to be sufficient.


Reply:I lay out the the welds at each end then working toward the center on the prescribed pattern (2" on 8" centers) when they over lap somewhere past the center line I punt. No I make sure that the center has the minimum weld called for.





Reply:Weld stitching is a minimum.  Unless what you are welding is exposed architecture that people will gaze at for hours just do the stitch 2 every 8 inches and at the end make sure you put a 2 inch long bead.  The other situation where you have to make it look nice is for truckers... They are the worst for wanting things pretty to the point of sacrificing strength and utility.  If you have the last one with a 4 inch gap that is no problem.  The inspector looks to see that you AT LEAST put in the 2-8 pattern.  Your boss might have also mentioned that if it is something like a connecting plate on a beam you must do a "return" running a 2 inch end bead on both sides of the joint.  Some rules only call for a one inch return... best to ask.
Reply:This is what we do where I work.It works on any stitch weld pattern ( 2-8, 3-9, 4-12,…..) and any length of part.It will be easier if you get a project calculator like the one pictured below. This one is from Wal-Mart but you can get them at Home Depot or Lowes too. The one from Wal-Mart runs about $14.00Example 12-8 stitch weld47-1/2” partfull length welds at beginning and end of part.Subtract the length of one weld from the length of the part,47-1/2” – 2” = 45-1/2” Divide that number by the desired spacing between the weld centers.45-1/2” ÷ 8 =  5-11/16 The thing to remember is that the 5-11/16 number in this example is not a measurement but the number of welds if the weld spacing is exactly 8”. Because you want welds that are all consistent in length, this number will most likely be rounded up to the next whole number, so 5-11/16 rounds up to 6. Now take 45-1/2” and divide it by the number of welds(45-1/2” is the overall length of the part minus the length of one weld)45-1/2” ÷ 6 = 7- 9/16”So what you will have is 2 – 7- 9/16”.Lay out a 2” weld on either end of the part and then work your way across laying out 2” welds on  7- 9/16” centers.Example 23-9 stitch weld47-1/2” partFull length welds at beginning and end of part.Subtract the length of one weld from the length of the part,47-1/2” – 3” = 44-1/2” Divide that number by the desired spacing between the weld centers.44-1/2” ÷ 9 =  4-15/16 The thing to remember is that the 4-15/16 number in this example is not a measurement but the number of welds if the weld spacing is exactly 9”. Because you want welds that are all consistent in length, this number will most likely be rounded up to the next whole number, so 4-15/16 rounds up to 5. Now take 44-1/2” and divide it by the number of welds(44-1/2” is the overall length of the part minus the length of one weld)44-1/2” ÷ 5 = 8- 7/8”So what you will have is 3 – 8- 7/8”.Lay out a 3” weld on either end of the part and then work your way across laying out 3” welds on  8- 7/8” centers.Example 33-12 stitch weld72-1/4” partfull length welds at beginning and end of part.Subtract the length of one weld from the length of the part,72-1/4” – 3” = 69-1/4” Divide that number by the desired spacing between the weld centers.69-1/4” ÷ 12 =  5-3/4 The thing to remember is that the 5-3/4 number in this example is not a measurement but the number of welds if the weld spacing is exactly 12”. Because you want welds that are all consistent in length, this number will most likely be rounded up to the next whole number, so 5-3/4 rounds up to 6. Now take 69-1/4” and divide it by the number of welds(69-1/4” is the overall length of the part minus the length of one weld)69-1/4” ÷ 6 = 11- 9/16”So what you will have is 3 – 11- 9/16”.Lay out a 3” weld on either end of the part and then work your way across laying out 3” welds on  11- 9/16” centers.I hope this helps.It can get a little confusing, just take your time and practice.Keep in mind that most shops have a ton of “unwritten” rules to follow, so ask questions.

Attached Images

Will
Reply:

Originally Posted by 4on12

This is what we do where I work.It works on any stitch weld pattern ( 2-8, 3-9, 4-12,…..) and any length of part.It will be easier if you get a project calculator like the one pictured below. This one is from Wal-Mart but you can get them at Home Depot or Lowes too. The one from Wal-Mart runs about $14.00Example 12-8 stitch weld47-1/2” partfull length welds at beginning and end of part.Subtract the length of one weld from the length of the part,47-1/2” – 2” = 45-1/2” Divide that number by the desired spacing between the weld centers.45-1/2” ÷ 8 =  5-11/16 The thing to remember is that the 5-11/16 number in this example is not a measurement but the number of welds if the weld spacing is exactly 8”. Because you want welds that are all consistent in length, this number will most likely be rounded up to the next whole number, so 5-11/16 rounds up to 6. Now take 45-1/2” and divide it by the number of welds(45-1/2” is the overall length of the part minus the length of one weld)45-1/2” ÷ 6 = 7- 9/16”So what you will have is 2 – 7- 9/16”.Lay out a 2” weld on either end of the part and then work your way across laying out 2” welds on  7- 9/16” centers.Example 23-9 stitch weld47-1/2” partFull length welds at beginning and end of part.Subtract the length of one weld from the length of the part,47-1/2” – 3” = 44-1/2” Divide that number by the desired spacing between the weld centers.44-1/2” ÷ 9 =  4-15/16 The thing to remember is that the 4-15/16 number in this example is not a measurement but the number of welds if the weld spacing is exactly 9”. Because you want welds that are all consistent in length, this number will most likely be rounded up to the next whole number, so 4-15/16 rounds up to 5. Now take 44-1/2” and divide it by the number of welds(44-1/2” is the overall length of the part minus the length of one weld)44-1/2” ÷ 5 = 8- 7/8”So what you will have is 3 – 8- 7/8”.Lay out a 3” weld on either end of the part and then work your way across laying out 3” welds on  8- 7/8” centers.Example 33-12 stitch weld72-1/4” partfull length welds at beginning and end of part.Subtract the length of one weld from the length of the part,72-1/4” – 3” = 69-1/4” Divide that number by the desired spacing between the weld centers.69-1/4” ÷ 12 =  5-3/4 The thing to remember is that the 5-3/4 number in this example is not a measurement but the number of welds if the weld spacing is exactly 12”. Because you want welds that are all consistent in length, this number will most likely be rounded up to the next whole number, so 5-3/4 rounds up to 6. Now take 69-1/4” and divide it by the number of welds(69-1/4” is the overall length of the part minus the length of one weld)69-1/4” ÷ 6 = 11- 9/16”So what you will have is 3 – 11- 9/16”.Lay out a 3” weld on either end of the part and then work your way across laying out 3” welds on  11- 9/16” centers.I hope this helps.It can get a little confusing, just take your time and practice.Keep in mind that most shops have a ton of “unwritten” rules to follow, so ask questions.