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Handy little snippet if you fancy a read.
Cold formed, electric resistance welded tubing can be produced in round, square or rectangle shapes. ERW tube is produced by processing a flat rolled steel into strips which are cold-formed, welded and seam annealed or normalized (depending on the manufacturer). You can usually identify ERW tube by the blue strip down one side of the tube (which is the welded area). The ERW process can guarantee the weld to be as strong or stronger than the rest of the tube body. The origin from a flat strip results in a more concentric product than Cold Drawn Seamless (CDS). ERW can also be known as CREW (Cold Rolled Electric Welded). Typical Applications: Structural columns, beams, supports, heavy equipment frames with 58,000 PSI tensile. Cold Drawn Welded (CDW) Produced from a steel strip by cold forming, electric resistance welding (ERW) and cold drawing to finished dimensions, CDW is the most versatile and widely sold mechanical tubing grade. A variety of thermal treatments can be applied to alter the mechanical properties and machinability. CDW is used for a tremendous variety of machine parts where close tolerances and higher mechanical properties are needed. Typical Applications: Automotive components, shock absorbers, hydraulic cylinders, sleeves, bushings, axles and shafting. Drawn Over Mandrel (DOM) DOM is formed from strip and Electric Resistance Welded (ERW) then cold drawn through a die and over a mandrel resulting in improved inner surfaces and dimensional quality. This process, called cold drawing, may be repeated more than once to reach the planned OD, ID, or wall dimension. Multiple draws can also be used to increase the strength or improve the surface finish of the tubes. During the drawing operation, the tubes may be process annealed to increase the ductility of the material. Lower cost alternative to CDS with equal or superior physical properties. Typical Applications: Machined parts, rollers, shafts, sleeves, steering columns, axle tubes, drive shafts, bushings and is most readily adaptable in cylinder applications with a 80,000 PSI tensile. Cold Drawn Seamless (CDS) General purpose seamless tubing, which is a solid bar of carbon steel drawn over a mandrel to form the tube section. CDS allows selection of chemistry and rough tube size. Cold drawing produces higher physical properties without heat treating. Offers widest range of sizes and chemistries in mechanical tubing. Better tolerances and reduced machining allowances over Hot Finished Seamless (HFS). Typical Applications: Machined parts, bushings, spacers, bearings, rollers, shafts, sleeves and cylinders with a 75,000 PSI tensile. Cold Rolled Electric Welded (CREW) Cold rolled steels are steels that are shaped by high pressure rollers at normal temperature in the steel mill. Cold rolling work hardens the material substantially. The steel is then welded by the electric weld process. A cold rolled steel can be either a mild steel or a high carbon steel. Can also be termed as ERW (Electric Resistance Welded). See » ERW Hot Rolled Electric Welded (HREW) Hot rolled steel is steel that is rolled to size in the mill while red hot. Hot rolling steel does not work harden it as much as cold rolling. For this reason, hot rolled steel is more easily machined than cold rolled. What's the difference between Tube and Pipe? The general term for pipe was that it was primarily used for carrying gas or liquid. It was not intended for structural use because the dimensions used in describing pipe was not dimensionally accurate. Measurement was referred to its inside diameter and wall thickness. The inside diameter was a true dimension, but over the years had become "nominal" (in name only) so that when pipe size was referred to, it was an approximate inside diameter measurement with the thickness described by the term "schedule". |
#2
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shaved chicken legs and hairy mole ears
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#3
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#4
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Cats ears make nice comfy pads where bits on the chassis might rub you..
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#5
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Ash, did you type that long thread or pasted it????
how,s the build? andy
__________________
Flat Pack Chassis Kits for sale, contact me at andyroadster@yahoo.co.uk |
#6
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Quote:
i typed it out for another forum ages ago but saved it in notepad as i knew it would be usefull one day. cracking on got the rad today so that will be going on this weekend. i have got about 10 jobs left on the list to do before i can sand blast and paint the chassis. then its on to floor and body pannels, pipes and wires, fuel tank, running gear, engine..............sod it i can't be bothered to type any more. |
#7
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Thanks for a very very useful post, now I know what I'm looking for.
Last edited by Land Locked : 22nd May 2009 at 06:41 AM. |
#8
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The other welding question.
It would appear that the Sarf Efriken sevenesque people look with disdain on any form of welding except TIG. To them TIG is the the holy grail AND the only remotely acceptable way to weld a chassis. Yes TIG makes very pretty welds, but do we need to be that anally retentive? |
#9
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I dont think we do need to be that analy retentive. As if you're welding properly then the material should break before the weld does.
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i started of with the mig on my chassis then wnet to tig then back to mig as the tig was to slow for someone impatient like me.
i only crack the tig out for little jobs like closing up the ends of the chsaais tubes these days. oh and it will come out again to do the ali fuel tank. |
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