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  • bgilbertsound commented on MircoSlepko's instructable Raptor 5: a Fully Iron CNC DIY4 months ago
    Raptor 5: a Fully Iron CNC DIY

    Primo- mi dispiace, non posso parlare l'Italiano bene... conosco piccolo parola.A note about your correcting the warped weld with a butane torch... you did the right thing, and probably STRENGTHENED the weld area rather than weakend it. Whenever you weld metal, the weld area shrinks as it cools and locks in stress. By "post-heating" the weld area, you anneal the metal and relieve some of that stress, making it less likely to crack later (under very high loads or cyclic vibration... not likely here) You can also reduce the chance of weld warping by "pre-heating" the weld area with a torch, or by welding a small bit at a time... like a 1cm weld, then skip 20cm and weld another 1 cm. When the area has cooled, go back and make another 1cm weld. It takes a long time, but ...see more »Primo- mi dispiace, non posso parlare l'Italiano bene... conosco piccolo parola.A note about your correcting the warped weld with a butane torch... you did the right thing, and probably STRENGTHENED the weld area rather than weakend it. Whenever you weld metal, the weld area shrinks as it cools and locks in stress. By "post-heating" the weld area, you anneal the metal and relieve some of that stress, making it less likely to crack later (under very high loads or cyclic vibration... not likely here) You can also reduce the chance of weld warping by "pre-heating" the weld area with a torch, or by welding a small bit at a time... like a 1cm weld, then skip 20cm and weld another 1 cm. When the area has cooled, go back and make another 1cm weld. It takes a long time, but warps much less.

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