For steel tube joining various methods are involved welding , adding a small bit of pipe slightly larger than two pies all having threads insert both pipes into the small bit pipe applying shellac varnish or araldite makes bonding. Another method is brazing and silver brazing
Brazing is the leading method of metal joining in many HVAC (Heating, Ventilation, Air Conditioning) appliances and equipment. It is also commonly used in joining or repairing copper pipes. As a general rule, brazing is used when solid, leak proof joints must be made without melting the base metals (which rules welding and soldering out.)Where a filler metal is heated above and spread between two or more close-fitting parts by capillary action. The filler metal is brought a little above its melting temperature while protected by a good enough atmosphere.Then it flows over the base metal (known as wetting) and then is cooled to join the workpieces together.The temperatures used to melt the filler metal is above 842 °F.
you use iron for ironing your clothes,
I have found through experience that hot rolled steel will take 95/5% solder, and that cold rolled will not solder, reason is the cold rolled steel molecules are arranged differently that the hot roll, they are so to speak pushed into the final dimension with extreme pressure this also causes a so called hardened tempered surface on the cold roll steel that has to be annealed so that it can be drilled. cut or soldered.
The first industry to use simple machines (levers, wheels, wedges...) - farming The first industry to use complex machines- milling The first industry to use powered machines- textiles The first industry to use engines- mining The first industry to use robots - auto-manufacturing
You should use solder, not brazing. Brazing is used to join iron or steel products together.
Brazing isn't welding - it's more like soldering. You use a rod made out of brass for the process of brazing.
You usually do not braze copper, you solder it. If you were to use brazing rod on copper, the copper would have very close to the same melting point as the brazing rod. This makes it difficult to do. As far as preheating the copper, it needs to be hot enough for the brazing to flow.
Brazing for hobbies
You must use flux while brazing because the flux prevents oxides from forming while the metal is heated. The flux also serves the purpose of cleaning any contamination left on the brazing surfaces.
You use an acetylene torch and special brazing rods.
brazing clints head
If the hole is very small the material you are brazing with should fill it. A small piece sheet metal can be brazed in place to cover larger holes.
Brazing is also known as soldering or soft soldering in the layman vernacular.
Brazing
Flux can be applied using brazing rods. Bronze and Steel weldings can also be applied using brazing rods. You can also apply iron and other types of metal.
1. Joint Design2. Choice of Brazing Filler Metal Alloy3. Pre-cleaning4. Fluxing the Joint5. Heating the Joint and Applying the Filler Metal6. Removing the Flux Residues After Brazing