Brazing
Brazing is a welding process using nonferrous filler alloys that do not contain iron or steel and have a melting point above 840°F but below that of the base metal. Brazing is also called 'hard soldering' or 'silver soldering.' Brazing is the only welding process in which the melting of the base metal is not necessary for coalescence. Click here for more information on brazing alloys.
Soldering
Soldering is a joining process using non-ferrous filler alloys.
Soft soldering uses alloys that melt between 190 to 840°F and is used in electronics, plumbing, and joining sheet metal parts. Soldering is not considered a welding process. Lead and tin are common alloys used in soldering, but there is also less common lead-free solder to decrease environmental impacts.
Weldability
The term weldability, or joinability, means:
- the ability of metal to be welded into a structure that will perform its purpose satisfactorily, and
- the degree of simplicity of the procedures used to produce welds with properties that are equal to or better than the properties of the base material.
Many factors influence the weldability of metal, including:
- the chemical composition of the metals involved;
- the effect of radical temperature changes on the various elements;
- the expansion and contraction characteristics of the base metals;
- the filler metal (welding rod or electrode);
- the joint design; and
- the welding procedure.
Knowledge Check Choose the best answer for the question.
1-2. The ability of metal to be welded into a structure that will perform its purpose satisfactorily is called _____.
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