Insulating blocks for welding?

[JackOfDiamonds]

I braze a lot of little trinkets with oxy-acetylene. Usually I prop them up for tacking on my steel welding table but sometimes this really ***** the heat out of the parts in contact with the table; it's like an infinite heatsink. I tried using squares of ceramic tile as surfaces which are really cheap and also flat and they work great for brazing surfaces right up to the point they explode if they get too hot.

Is there an asbestos-like material for this that is insulating, but won't break like ceramic tile?

 

[dogdog]

kalwool (about $100 for a box shipped) ? or firebrick ($50 for box of 6 I think) ? I think those stands up to about 2500F...



These are common DIY stuff..

you can DIY them for fun if Clay and saw dust is available for cheap in your neck of the woods.

or perlite and sodium silicate

 

[dogdog]

Pardon Our Interruption...

Pardon Our Interruption...

 

[dogdog]

This is another recipe

 

[JackOfDiamonds]

I'm not 100% sure that firebrick like for fireplaces won't also shatter if they are heated in one spot with a torch.

 

[dogdog]

I'm not 100% sure that firebrick like for fireplaces won't also shatter if they are heated in one spot with a torch.

Plenty of videos on youtubes on firebricks... commercial ones or DIY ones...

 

[RPH]

I used to work in the induction heating industry. The coil builders would make some amazing things from copper and silver braze. One thing every one had was 3 pieces of rod brazed as a teepee. They used this to hold and fixture the pieces into place while brazing. Look at the pieces required to assemble this coil. Used to heat treat rear carrier. Try thinking what you can use for this.

 

[ttpete]

Refractory ceramic material.
https://www.amazon.com/dp/B08F48GBHF/?tag=atomicindus08-20

 

[rlitman]

If you're working with oxy-acetylene and little trinkets, you want a ceramic jeweler's block.

That's a ceramic block with a honeycomb structure that prevents the block from absorbing heat, and keeps the heat where you put it. It's also designed for this exact sort of torch work. Many have a waffle underside that limits loss of heat to your bench. Here's one example: