Braze melting temperatures

Brazing a process of joining metals in which, during or after heating, molten filler metal is drawn by capillary action into the space between closely adjacent surfaces of the parts to be joined. In general, the melting point of the filler metal is above 500°C, but always below the melting temperature of the parent metal. 

Filler alloys used for soldering or brazing melt at a temperature lower than that of the metal or alloy soldered. A filler fills in gaps between areas of the parts to be joined and, as it cools down, solidifies and adheres to each part, providing a permanent and stable join between them. Two soldering... 

Brazing Materials. Limited to a melting temperature above 1,000°F (538°C). Filler wire shall be preplaced or hand (face) fed. The product form of paste (filler) shall not be permitted. (See para. GR-3.3.4 for brazing materials requirements.)... 

Cadmium has the effect of lowering the melting temperature and represents the best combination of melting range, flow characteristics and mechanical properties but can produce toxic fumes during brazing (covered by COSHH Regulations). 

Soldering Similar to brazing, except the melting temperatures of the filler metal are lower. Heating is done using a soldering iron. Fluxes, lead fumes, bums... 

Heat is applied to the parts to be joined which melts a manually fed or pre-placed filler braze metal (which has a melting temperature >450 °C) into the joint by capillary action. A flux is usually applied to facilitate wetting of the joint, prevent oxidation, remove oxides and reduce fuming (see 7.12F). 

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