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| Resurrection of a CFEI 100 KVA Induction Furnace |
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| awemawson:
I was determined to get the four six foot long upright box sections stripped of their paint today, so grabbing a cold (cooked!) sausage in lieu of breakfast I got out early before other things distracted me. Four stripper disks later and about an hour and a half of angle grinder time not only was EVERYTHING covered in paint dust but the uprights are at last stripped. . . . let the welding commence :clap: |
| awemawson:
I'm sure this job is jinxed :bugeye: I had set up for the first weld and then was conscious of a hissing sound :bang: A bit of hunting about and I found that the plastic upright tube of my 'Peashooter' Argon flow gauge was leaking where it screws into it's base / tap / outlet thingy. At £160 per bottle leaks cannot be tolerated ! Fortunately I was able to unscrew it by the expedient of wrapping a bit of 200 grit wet and dry round it and gripping in the lathe chuck, expecting it to crack at any moment. It unscrewed suddenly with a flurry of ball bearing / inner tube and odd shaped plastic spacer falling in the swarf ! OK it just needs screwing together with something to seal the threads. Being plastic I'd usually use PTFE tape but getting the ball, inner tube and spacer in necessitated partially threading it on first so non too easy with tape. I resorted to Loctite 542 that says on the bottle 'do not use on plastic fittings' - well I did ! It needs a bit of time to cure, so I stopped for an early lunch. After about 45 minutes it seemed at least partially cured so I re-assembled it on the regulator and resumed welding. All went reasonably well. I've finished the first 'frame' which could be front or back, left or right as it's symmetrical. Not surprisingly there is a bit of a twist in it, only about 8 mm but I should be able to pull it back when it's got the rest of the bits welded to it. I'm quitting while I'm ahead and will resume tomorrow as the oil boiler man is due back this afternoon. |
| Spurry:
Looking good so far. :clap: Do you use anything special when welding galvanised steel in the way of breathing apparatus? Pete |
| awemawson:
Wide open doors both ends of the welding shop and hope the fumes clear before they get you ! The galvanising certainly gives a greater tendency to porosity, and the flare from the burning zinc when the arc starts can be a bit distracting. If these were critical welds I'd strip the zinc with acid first but they aren't. As usual it's massively over engineered! |
| Pete W.:
A one-time neighbour of mine worked as a welder. I asked him about welding galvanised items and he said the thing was to drink lots of milk. Is that founded on reality or is it an old wives' tale? |
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