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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Bonding titanium
OK, this one is pretty far out on the fringes, but if you've dabbled
with small pieces of titanium as I have, you may have faced the frustration of not being able to weld it with practical methods. It bonds quite well with epoxy, but there is a wide range of epoxy performance with titanium. It can produce lap/sheer strength of up to 5,000 psi or so if you use the right materials. Here are some test results from Master Bond, which does a lot of specialty-adhesive development: https://tinyurl.com/yaw6mdt7 -- Ed Huntress |
#2
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Bonding titanium
Use that new glue - called TIG or something like that :-)
Martin On 3/27/2018 10:19 AM, Ed Huntress wrote: OK, this one is pretty far out on the fringes, but if you've dabbled with small pieces of titanium as I have, you may have faced the frustration of not being able to weld it with practical methods. It bonds quite well with epoxy, but there is a wide range of epoxy performance with titanium. It can produce lap/sheer strength of up to 5,000 psi or so if you use the right materials. Here are some test results from Master Bond, which does a lot of specialty-adhesive development: https://tinyurl.com/yaw6mdt7 |
#3
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Bonding titanium
On Fri, 30 Mar 2018 18:13:45 -0500, Martin Eastburn
wrote: Use that new glue - called TIG or something like that :-) Martin Right, but even oil from your hands can embrittle a titanium weld. To get a strong join, the provess is very exacting. -- Ed Huntress On 3/27/2018 10:19 AM, Ed Huntress wrote: OK, this one is pretty far out on the fringes, but if you've dabbled with small pieces of titanium as I have, you may have faced the frustration of not being able to weld it with practical methods. It bonds quite well with epoxy, but there is a wide range of epoxy performance with titanium. It can produce lap/sheer strength of up to 5,000 psi or so if you use the right materials. Here are some test results from Master Bond, which does a lot of specialty-adhesive development: https://tinyurl.com/yaw6mdt7 |
#4
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Bonding titanium
On Fri, 30 Mar 2018 19:27:18 -0400, Ed Huntress
wrote: On Fri, 30 Mar 2018 18:13:45 -0500, Martin Eastburn wrote: Use that new glue - called TIG or something like that :-) Martin Right, but even oil from your hands can embrittle a titanium weld. To get a strong join, the provess is very exacting. But it isn't rocket science. We welded titanium in the Air Force, in fact I was certified to weld it as of about 1971. Chemically clean, don't contaminate the welding area, weld in an inert atmosphere. For certification we welded in a Plexiglas box with attached gloves, purged before welding, but a mate who worked at the depot said that they welded it without using an inert box by using a heavier then normal gas flow and back purging as well. They were welding heating and pressurization ducts for the C-something and apparently there was considerable welding to be done. As an aside, when certificating any color change at all after welding was reason for disqualification :-) -- Cheers, John B. |
#5
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Bonding titanium
On Sat, 31 Mar 2018 08:17:44 +0700, John B.
wrote: On Fri, 30 Mar 2018 19:27:18 -0400, Ed Huntress wrote: On Fri, 30 Mar 2018 18:13:45 -0500, Martin Eastburn wrote: Use that new glue - called TIG or something like that :-) Martin Right, but even oil from your hands can embrittle a titanium weld. To get a strong join, the provess is very exacting. But it isn't rocket science. We welded titanium in the Air Force, in fact I was certified to weld it as of about 1971. Chemically clean, don't contaminate the welding area, weld in an inert atmosphere. Yup. For certification we welded in a Plexiglas box with attached gloves, purged before welding, but a mate who worked at the depot said that they welded it without using an inert box by using a heavier then normal gas flow and back purging as well. They were welding heating and pressurization ducts for the C-something and apparently there was considerable welding to be done. You've just described "exacting." g Purged Plexiglass boxes with attached gloves; heavy argon flow; back-purging... Jeez, John, do you weld steel trailers that way, too? What you're describing is exactly what I was talking about. As an aside, when certificating any color change at all after welding was reason for disqualification :-) It's tricky. The trickiness of making strong welds in titanium is the reason the Soviets made the MIG-25 Foxbat out of stainless steel. -- Ed Huntress |
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