jamesp
Cave Dweller
Member since October 2012
Posts: 36,159
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Post by jamesp on Nov 15, 2020 20:04:18 GMT -5
You may have to call the supplier to find out if this white HDPE can be fused to black pipe grade HDPE before purchasing black end caps. I had never seen white HDPE pipe. It shouldn't be much different than the black. I'm guessing it is the same and fuses, but I better check before investing/buying the black. I was thinking about fusing 2 reducers together if I can't find the right end caps. Would look odd, but should work??? Not a thing wrong with using 2 reducers. You can always saw an sample inch off the 4 inch side and do a test weld with black HDPE pipe to see how it welds. I was going to suggest cutting an inch off each 4 inch end and then quarter them to do some practice welds on a small scale before doing the full circumference 6 inch weld. I welded two 1" x 2" sawn chunks together first and got it right the first time, even smashing them on concrete with a 3 pound hammer would not break the weld. The weld strength is off the chart.
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panamark
fully equipped rock polisher
Member since September 2012
Posts: 1,343
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Post by panamark on Nov 16, 2020 18:15:40 GMT -5
Great advice Jim. Thanks. I will post an update when I get progress.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,159
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Post by jamesp on Nov 20, 2020 6:51:11 GMT -5
Great advice Jim. Thanks. I will post an update when I get progress. Electric stove weld: When heating in the teflon coated fry pan with fittings take the heat up real slow. I put the electric burner on the lowest setting and let the weld faces heat up to 200-220F for about 15 - 25 minutes. This 'soaks' the faces with lots of heat safely. Nothing happens to the plastic below 250F. Best to rotate the pipes a third of a rotation for each 5 - 8 minutes to 'mix' the heat up around the perimeter. Just in case the contact is not equally mating to the pan. i.e. pan slightly bent or not making equal contact to the electric burner... Once the heat has soaked into the first couple of inches up the pipe from the weld face I hit it with full heat - electric burner cherry red. Now heat is increasing rapidly, I push down on each fitting with one hand bearing down on each fitting. As soon as I see a melt bead squeezing out of the side full perimeter I stick them together. This usually takes 2 to 4 minutes from cranking to full heat. The melt bead should be 3/32 to 1/8 inch protruding from mated surface full perimeter. I was pressing the reducer down on to the round ended but cap. For a foundation I set the round ended butt cap into a 6 inch stainless dog food bowl on a table a bit lower than the kitchen counter. Then pressed the reducer down on to the butt cap with my upper body with a good bit of force and with my body weight. I actually let my chest rest on the top of the reducer to add to down force. Make sure you line them up well before pressing down. Note - Faces must be dead clean and fry pan must be dead clean. No butter or cooking grease !
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