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Tool Talk Discussion Forum

Re: Mig Welding Cast Iron with Stainless Wire (Video)

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Stick welding

04-13-2013 14:27:07

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The holes do help because there is no corner/notch for the crack to progress. A little off topic for cast iron but in school we were taught that the only holes that should go in a semi trailer frame (for a lowboy) have to be round. I have seen other shapes used but the corners always have a big radius rather than square. The holes make the trailer lighter and give more carrying capacity because of the reduced weight. Strange but true they basically make the trailer stronger. Same as a tubular beam can be stronger than a solid bar because the weight of the solid bar.

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T in NE

04-14-2013 18:41:02

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 Re: Mig Welding Cast Iron with Stainless Wire (Video) in reply to Stick welding, 04-13-2013 14:27:07  
That's why airplane windows have round corners instead of square. Rounded corners don't stress the metal as much and it is less likely to crack. That's true for any hole you put in metal, having a radius instead of an angle is better.

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Dusty MI

04-13-2013 16:10:22

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 Re: Mig Welding Cast Iron with Stainless Wire (Video) in reply to Stick welding, 04-13-2013 14:27:07  
I understand the need for drilling small holes at the ends of a crack if it is not going welded. But does it do any good to drill the holes just before you weld the crack?


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Stick welding

04-13-2013 16:19:15

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 Re: Mig Welding Cast Iron with Stainless Wire (Video) in reply to Dusty MI, 04-13-2013 16:10:22  
Yes, because the heat can cause the crack to continue. It's kind of like a notch effect.

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