68' long steel Warren Truss private Train Trestle

Old 12-23-04, 05:37 AM
Casey Jones
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68' long steel Warren Truss private Train Trestle

http://www.dochemp.com/bigtrains.html .. can see project here ...
am new to this forum .. Casey Jones ...

have welded track and steel ties with 6011 due to flexiblity and expansion issues ... but on this trestle ... 3" X 1/4 angle ... 2" X 1/4 angle and 3" channel every 2 feet across the bottom with 10' - 3" angel every 10 feet with 2" angle back up to the sides for lateral support

suggestions are running about 50 - 50 to continue with 6011 for the same reasons or go to 7018 and 7024 for the flat welding as per more strength and inherently better welds for a relative newbie. .. some say the ductility of 7018 and 7024 are just as good as 6011 anyway?
Also .. how important is preheating the metal with a brush burner to keep more hydrogen out of the weld?

Old 12-23-04, 11:18 AM
Casey Jones
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Just got thru talking with Miller Welding ... the 7018 is more ductile and flexible than the 6018 ... the 7024 is much less ductile ... so .. 7018 it is ...
shinny rails,
Casey Jones
Old 12-24-04, 04:52 AM
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Yes, 7018 would definitely get my vote as well. We've tried it in tests where I work and had 6011 develop cracks particularly with alloyed steel and gone right over it with 7018 and held up really well. The 6011 is a good all around rod, but if its clean metal , I'd always opt for the 7018.

Just my 2 cents worth.

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