- Thread starter robdxr2
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I need one of those then lol
Richard.
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Best Start saving the pennies. Those things are a fortune.
matt1978
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We used the AMI ones, they seemed to be the market leaders at the time. I think the power source/controller was around £18k and each closed head was around £8k.
On projects like that though money appears to be no object.
All of the fittings (tee's, elbows etc) are cleaned in the clean room on site, then sealed in a argon filled bag and only opened in the minutes leading up to welding. All of the The system pipe work has a constant trickle purge running from the day it's started until the day the final butt is done and it becomes a closed system.
On projects like that though money appears to be no object.
All of the fittings (tee's, elbows etc) are cleaned in the clean room on site, then sealed in a argon filled bag and only opened in the minutes leading up to welding. All of the The system pipe work has a constant trickle purge running from the day it's started until the day the final butt is done and it becomes a closed system.
Rrunnach
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I can't remember company my mates worked for, company was based in Livinston. With a handful of my students, we had a tour around their shop. In the clean conditions room, some of the welders were running various procedures for pending work. They would rip the head off, anyone calling them button pushers.....lol.
Richard.
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Lol. And who could blame them. It's a similar misconception in all automated welding processes. Just because the process can be used more easily and learned quicker doesn't mean the guy using it is not a up to spec in various manual processes too. I know a couple of guys who work with SAW along with many manual processes welding pipes. The tool is there to increase productivity and repeatability only.
It was perfect results with minimum skill I liked the sound of. ..anything expensive is beyond my reach. LolBest Start saving the pennies. Those things are a fortune.
Richard.
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Yep. That's the one mate. I knew I'd spelt it wrong.
Brad93
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Yes Titanium is not as suitable in high temperature exhaust as inconel 625. American guys use it in some high power turbo motors on the headers, iirc once past the turbo the egt,s have dropped enough to resume use of 321 SS which is alloyed with titanium for improved mechanical characteristics.
Brad93
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Nevertheless, F1 exhausts rarely completes more than 1200km since the need to save weight means they have to be designed close to the limit. The thickness of the heat-resistant steel adopted from the aerospace industry varies but is never more than 1 millimeter. But what eventually kills these waste-gas works of art is not vibration or temperatures of 1000 degrees and more, but stress, The different radii of the various pipes ultimately produce fatigue which leads to cracks where the stress is greatest. Not surprisingly, at this high level of performance even the best exhaust are soon exhausted.
Heat-resistant steel adopted from the aerospace industry it's called inconel also called Alloy 718 (approximately 60% Nickel and 22% Chromium + trace Molybdenum and Niobium). Inconel is a registered trademark of Special Metals Corporation that refers to a family of austenitic nickel-based superalloys. Inconel alloys are typically used in high temperature applications. It is often referred to in English as "Inco" (or occasionally "Iconel"). Inconel alloys are oxidation and corrosion resistant materials well suited for service in extreme environments. When heated, Inconel forms a thick, stable, passivating oxide layer protecting the surface from further attack. Inconel retains strength over a wide temperature range, over 1000C. Inconel is a difficult metal to shape and machine using traditional techniques due to rapid work hardening.
Heat-resistant steel adopted from the aerospace industry it's called inconel also called Alloy 718 (approximately 60% Nickel and 22% Chromium + trace Molybdenum and Niobium). Inconel is a registered trademark of Special Metals Corporation that refers to a family of austenitic nickel-based superalloys. Inconel alloys are typically used in high temperature applications. It is often referred to in English as "Inco" (or occasionally "Iconel"). Inconel alloys are oxidation and corrosion resistant materials well suited for service in extreme environments. When heated, Inconel forms a thick, stable, passivating oxide layer protecting the surface from further attack. Inconel retains strength over a wide temperature range, over 1000C. Inconel is a difficult metal to shape and machine using traditional techniques due to rapid work hardening.
Rrunnach
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Pre CNC days, our lads turned and milled various fantastic engineering shapes and dimensions by use of bog standard mills and lathes. I don't recall them ever saying "difficult metal to shape and machine". I was end of line, where I would nail the Inco together, weld colours were beautiful around HAZ. I don't know where this difficult to machine nonsense comes from?
daleyd
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We used to use furnace electrodes with m12 studs in inconel which were tightened up on to braided silver straps and copper bus bars, if the threads snagged when tightening or loosening them on a furnace rebuild it was virtually impossible to do anything with them. Seemed very much like stainless in that respect, don't know about being difficult to machine though?
Rrunnach
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Use filler, rob. I have viewed and repaired a few autogenous weld that have failed, normally at one or other tuther side of toe.
Richard.
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A competent machinist that knows his metals and how to deal with them can cut it easily. It does work harden (to what degree I don't know for sure) letting the tool rub and not knowing how to deal with it may result in it been more difficult to machine. I've never personally tried to machine it so I can't comment from an experience PoV.
Rrunnach
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Back in the day, the then Scottish Gas, or maybe it was British Gas, had a research centre near Dalgety Bay, Fife. Combo of stuff from domestic, to high heat burn units for up and coming gas powered, power stations. Some of the components were really sophisticated and, complex machined parts, I had the easy bit, sticking it altogether, from my faded memory, I do recall shrinkage being a problem, during and after hot work. Probably more to do with the design of component.
I remember vividly one component, after completing hot work, I had a couple of small parts left over.....chit, they were small baffle plates, which were there to help dissipate entering natural gas, I clean forgot to weld them in, oche well, it was too late, I had closed it all up, job handed into inspection dept, who would have no idea if parts were in place, job never returned, I was off the hook....lol.
I remember vividly one component, after completing hot work, I had a couple of small parts left over.....chit, they were small baffle plates, which were there to help dissipate entering natural gas, I clean forgot to weld them in, oche well, it was too late, I had closed it all up, job handed into inspection dept, who would have no idea if parts were in place, job never returned, I was off the hook....lol.
