The heat source normally used for solder is electric soldering iron and other models welder . Once popular traditional heated iron solder fire is now rarely used. When deciding to use a tool you must remember that it is a waste of time to try to solder with a tool that is not strong enough for the job. Equally well, one that is too strong can heat up the solder too much and weaken the joint. For very fine work, you will most likely need to use iron soldering iron. Some gas blowlamps can do this job as well. For larger electrical work and weld jewelry and modeling, you can use a other models that carries a fine or extra fancy fire burner that is hot enough but not too big or spread required or one of the more powerful soldering irons. For capillary solder pipe work the blowlamp or torch gas joints are the most sensible choice. For soldering large metal bumps (or brazing), you need a strong welder.
Metal mass is the usual heat sink, and a good weight pair of pliers will often do the trick on the other hand, if the joint has a large surface area and is exposed to the air, it may spread the heat away too quickly. This can be overcome by attaching the joints in the temporary fireplace brick, or by burying part of it in the ash bed. Never put together on a good performing surface. Membatri uses a copper and zinc alloy that melts at a much higher temperature than solder (700-800 degrees C) and gives stronger joints. Special flux or borax paste is required. Braze (or bronze) welding uses the other models type of alloy, but instead runs to the fillet joints built on the surface. If the joint is small, it may be possible to reach the required temperature with blowlamp gas, by playing fire directly on the joint. If this does not work, a stronger source of heat is required. Brazed attachments available for use with arc welders. This usually takes the form of two fixed carbon bars in a hand clamp. The bow is made between the two ends of the rod, and the resulting fire is used to heat the joint.