#1
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4130 welding
Should a certain filler be used to keep the strength intact at the joints on moly? I've seen people welding moly cages in with regular -6, -3 rod and it just seems like to it would defeat the purpose of the moly itself. Shouldn't NHRA test this?
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Dan |
#2
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I believe they use that rod because the average guy will have better luck using it. Some of the 4130 get mixed in with it when welding. You don't want brittle joints. After welding the joint should be annealed. I THINK IT IS THE PREFERED ROD TO USE UNLESS THE WELDMENT IS GOING TO BE HEAT TREATED.
Mark
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Mark Last edited by mastuart; 04-19-2017 at 11:17 PM. |
#3
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Quote:
And so has the FAA, by the way. There have been many welding text books written which include the "4130 topic" and the basic rule is this: If you are going to heat treat the finished welded part, then you weld your 4130 with 4130 rod. If you are not going to heat treat the finished part/assembly, then you weld it with mild steel - e.g. ER70S6, 3, 2 or ER70D2, or RG45, or RG60, etc etc. Remember that countless numbers of airplane frames (airframes) were gas welded and TIG welded 4130 for the last 75 years, using mild steel fillers. NHRA specifies that all roll cages shall be 4130 of such and such wall thickness and welded with mild steel, using TIG - and there shall be a hole drilled in such and such location to verify wall thickness of the tubing. And the weld beads shall not be less than such and such width, so the the weld penetration should be sufficient for this assembly. Anyway, that is the general idea of what you are dealing with .....
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#4
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An' don't grind your welds on tubing.
Majority of the strength is in the fillet.
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Drew Schumann |
#5
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cage tubing
I tried some Docol R8. Strong, but weld friendly.
http://www.aedmotorsport.com/catalog.../docol-tube-r8 Nice stuff. I won't be going back to ChroMo.
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Bill Funk |
#6
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Quote:
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
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