I and wife searched in Thai and English, but import only on our end. Does anyone know where to get a hold on some silver solder (brazing rod)? I want to join stainless steel to copper and keep things food grade.

Let's move this to DIY.

 

Do you want silver solder or brazing rod, they are not the same thing?

brazing will work and is readily available.

 

What kind of torch do you have?

  

1 hour ago, Yellowtail said:

brazing will work and is readily available.

 

What kind of torch do you have?

 

Just a simple butane one. I previously tried the copper-phosphorus brazing rod that's available in all the AC repair shops with the appropriate (and ample) flux. It worked great for smaller joints with thicker metals, but the larger joint I'm working on with thinner metals keeps peeling off. It could be my methods though, and I heard silver solder is easier to work with.

 

@crossy, thank you, I didn't see that forum! As I understand it, Silver solder is what it's called, but it is a misnomer as it is used at brazing temps, so uhh... take your pick, lol.

You might try Laemthong Syndicate in Bangkok, they carry a pretty wide range of Harris products and we have bought a number of welding products from them, although not silver solder stuff. We got that from the US.

 

I like the Harris Stay-Silv flux for silver solder, but I have only ever used it for carbide to steel, never stainless to copper.

 

I have not found silver soldering more forgiving than brazing. If anything overheating seems to me to be more of an issue. For thin material a smaller, hotter flame is typically better.  You might try tacking, then more tacks, and more tacks until you get it filed in. A large chunk of copper to use as a heat-sink may be helpful as well.

A jewellery supply shop.