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WELDING 4130

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Mark.Summers(at)lwbref.co
Guest

Posted: Sun Feb 12, 2006 7:06 am Post subject: WELDING 4130

----- Forwarded by Mark Summers/LWB/WRE/Lhoist on 02/12/2006 09:01 AM -----

                                                                                                                                       

                      <dave(at)cfisher.com                                                                                                

                      >                        To:       <Mark.Summers(at)lwbref.com>                                                     

                                               cc:                                                                                     

                      02/10/2006 06:40         Subject:  WELDING  4130                                                                 

                      PM                                                                                                               

                                                                                                                                       

                                                                                                                                       



I received this from another reader that has been giving some experienced

advice just wanted to get another opinion and idea on the posting about

welding.

Mark ,



We spoke about welding.............





ANNEALING WILL SOFTEN YOUR METAL AND YOU ONLY WANT TO NORMALIZ to 800 to

900F .

I have been welding gas tig and mig for over 30 years ...........



Good luck,

Dave



Annealing increases ductility and removes stresses from formed or part

formed material, producing a large-grained structure, making the metal less



tough and easier to machine or cold-form. The process involves heating to a



suitable temperature, soaking at that temperature to create a stable

structure, then allowing the metal to cool very slowly.



The heat treatment condition is often identified by the letter 'A'

[annealed] or 'N' [normalised] after the alloy designation [4130 N] or a

code like '4130 QT900F' which indicates that the alloy has been quenched

and

then tempered at 900 F. Scratchbuilders use 4130 in the normalised

condition.



If it is necessary to recover full normalised strength in the joint areas

affected by welding members into an airframe, 4130 N tube structures have

to

be re-normalised. This is done by re-heating those heat affected zones,

with

an oxy-acetylene torch for example, to a temperature around 800/850 C and

then allowing the metal to cool slowly. The process must be carried out in

still air at normal temperature and some jigging may be required to prevent



distortion in the frame. Re-normalising will also relieve the heat

expansion/contraction stresses induced in the tubing near the weld. Pure

stress relieving, without re-normalising, occurs at temperatures around

650/700 C.





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iworonko(at)cox.net
Guest

Posted: Sun Feb 12, 2006 7:41 am Post subject: WELDING 4130

Great info but how do you tell at what temperature the material is at when 

you are heating it with a torch?

Eric

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donpearsall
Guest

Posted: Sun Feb 12, 2006 8:41 am Post subject: WELDING 4130

Eric, I was just looking at a temperature chart from my book "How to weld

damn near anything", and the annealing temperature for steel is 1700f, with

a color of orange. Here are the rest of the colors:



1000f - Faint red - Nitriding

1100f - Blood Red - Stress Relieving

1300- 1500f - Cherry Red - Atomic Changes

1600f - Salmon - Normalizing

1700f - Orange - Annealing

2000f - Bright Yellow Magnetism lost

2100-2500f - White - Forging

2600-2900f - Steel Melts



Don Pearsall

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