Karn3 Posted August 3, 2011 Share Posted August 3, 2011 I'm in the initial planning stages of making a gas forge mainly for fire welding, and I was wondering what temperature the blanket lining needs to be able to tolerate. I've found a place that I can easily get some from and the max temp theirs will go to is 1400 C. Is this enough or do I need something a little more heavy duty? If that is enough which one would be better because they come in different densities. Many thanks in advance! Quote Link to comment Share on other sites More sharing options...
pkrankow Posted August 3, 2011 Share Posted August 3, 2011 8# density 1300C (2400F) ceramic wool is commonly used. It requires a coating for a couple of reasons, to prevent air born fibers, to give the working surface a higher temperature rating (propane can generate temperatures over 3000F, 1650C), as well as to provide an IR reflective property to the inside of the cavity, which will improve efficiency. 8 pound/cu ft is 128 kg/cu m Phil Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted August 3, 2011 Share Posted August 3, 2011 Blanket liners tend to react to flux like cotton candy does to boiling water. What will the interior of the forge by coated with? Quote Link to comment Share on other sites More sharing options...
Karn3 Posted August 4, 2011 Author Share Posted August 4, 2011 I was going to follow the blueprint for a gas forge that's on here but apparently the page is broken at the moment. This is my first build so I'm not really up on everything yet, I didn't know that the flux reacted with the blanket for instance. Not that I've ever used flux for my firewelding, I was always told its an unnecessary extravagance. I've never really had any problems welding so I've never bothered. Also that's more money What sort of thing would you recommend I coat it with? On the off chance that I ever actually use flux I would like to avoid the cotton candy/water scenario. Quote Link to comment Share on other sites More sharing options...
pkrankow Posted August 4, 2011 Share Posted August 4, 2011 ITC100 is an industrial staple, and a very good product. I use a homemade mixture of about 70% zircon flour and 30% kaolin. Here's a burner. Phil Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted August 4, 2011 Share Posted August 4, 2011 Depends a lot on what you will be welding. If you start working with extremely high carbon high chromium high nickle alloys you may find that a good flux helps a whole lot! If you work with old real wrought iron flux is not so helpful. Most folks I know who do a lot of welding in their propane forge use a rammable refractory for the inner liner that is extremely resistant to flux like bubble alumina.(IIRC) Quote Link to comment Share on other sites More sharing options...
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