What is Brazing similar to soldering and braze

What is Brazing? – similar to soldering and braze welding because all three processes are done without melting the base metal or alloy as the bonding agent

Key Term • Soldering – the bonding occurs with metal alloys that melt at temperatures below 840 F – Some common uses of soldering are to join electrical wires, join copper gutters and spouts, sweat copper pipes, and fasten tinplated steel.

Key Term • Brazing – bonding of metals and alloys that melt at temperatures above 840 F when capillary action occurs – The temperature of properly prepared metal must first be raised to the melting point of the brazing alloy to be used. – The brazing alloy is then added by means of a long, thin rod called a filler rod. Copper-zinc alloys are the most popular filler rods for brazing. The alloy is drawn between parts and spreads throughout the spaces.

Key Term • Braze Welding – bonding with alloys that melt at or above 840 F, when capillary action does not occur – In this case the metal is bonded to each part, and the void between or around the part is filled with the metal alloy.

Advantages to Braze Welding • The process allows: – – – – The use of low temperatures Disassembly of the parts Different metals can be joined Working at high speeds Little damage to parts Easy realignment of parts Parts with various thicknesses to be joined

Comparison of Brazing and Braze Welding Uses capillary action and a thin layer of braze metal to join two pieces of base metal The alloy bonds to each part without capillary action

Torch Facts • Uses an oxyfuel torch, with acetylene being the most widely used fuel. • Torch tips have only one hole. Tips are identified by a number that designates the size of the hole. • Tips range from 000 (the smallest) to 10 or larger. Use a small tip for thin metal. • The tip size should increase as the thickness of the metal increases.

Procedure 1. Lay the clean metal flat on work table. 2. Using the properly sized welding tip, light and adjust the flame to a neutral flame. 3. Apply heat to the metal until the metal is a dull red. 4. Apply the flux. 5. Continue to heat the metal and move the filler rod in and out of the flame.

Procedure 6. When the metal is a red color, touch the filler rod to the metal as the filler rod melts, and feed the filler rod into the joint. 7. Let the assembly cool and examine it for completeness of the brazing. 8. Filler metal should be present on both sides of the joint.

Brazing A Lap Joint