Need welding tips for Rem 700 recoil lug - Page 4
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  1. #61
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    Quote Originally Posted by ulav8r View Post
    What about from those that know it is not a good idea.

    Aircraft frames made from 4130 are welded all the time. The tubing is not hardened and still the welds are coole slowl to normalize the joint to prevent cracking. A very few are heat treated afterwart to increase strength...
    It's done in race cars all the time as well... Normalizing is simple in non-heat treated steel... Normalizing HT steel can remove the temper.

  2. #62
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    4140, 4130, both susceptible to hardening from heat and quench, water or oil. What I've heard, read, rosebud torch to feather out the heat in an attempt to normalize/anneal the weld to avoid the bad properties of the 'heat affected zone'.

    'Good enough' for your garage hotrod. Maybe not the rifle in your face.

  3. #63
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    At least 2 aircraft manufacturers that I know of MIG their 4130 airframes. One is Rans the other is Cubcrafters. Both are quality. There may be others.

    Please donít weld your Rem 700 lug on. Iíll send you my Hollandís fixture for drilling them to pin it, just mail it back when youíre done. It can even be used in a regular old drill press/vise with a little care. You can pin it in 2 areas even if youíre worried about shearing the pins. Itís easier if your lug is pre-drilled. Iíve built and been around switch barrel Remingtons for 30 years and have yet to shear a pin. One of the best things Iíve done is use a roll pin. They are tough little bastards.

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  5. #64
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    Mauser receivers were mentioned a couple post prior. They are mild steel and surface case hardened. I have 2 or three of them that were annealed and double square bridges tig welded to them. They were then sent to Pac Met to be recased.


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