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Welding - Gas + Arc

Terms and Definitions OL question 4

Fusion Use of heat and pressure to melt material to form a permanent joint
Permanent Joint A joint which cannot be separated once it is formed without damaging or breaking
Arc Forms when electricity jumps between two materials. It creates the heat in a weld
Workpiece Materials being joined together
Flux Cleans the joint and prevents oxidation
Oxidation When metal is hot, oxygen attacks the weld and causes a poor joint due to a chemical reaction
Slag Created by melted flux, it prevents oxidation by forming a skin over the weld. It has to be chipped off when the weld is completed
Filler Rod A metal bar that is fed into the hot area of the weld to be melted and fill the joint
Electrode It melts to fill the joint with molten metal but also forms the Arc to create the heat for fusion to take place
Acetelyene It is burned to produce heat and mixed with oxygen to increase its burning temperature and have less dangerous emmissions
Neutral Flame An even mix of oxygen and acetylene. Used to weld steel. It has a rounded inner cone.
Oxidising Flame Has more oxygen than acetylene and is used for brazing. It is recognised by a small pointed inner cone.
Carburising Flame It has more acetylene than oxygen. It is used to weld aluminium. It has three envelopes (Parts) to the flame.
How can oxidation be prevented in welding? Using a flux to create a slag = Manual arc welding The oxygen can be burned = Gas Welding Using a gas shield = Mig and Tig welding
Flashback Arrestor Prevents the flame at the tip of the torch from igniting the gas in the tank or the hose
Welding torch Mixes the acetylene and oxygen to produce the flame
Regulator Adjusts the pressure in the hose for the right joining process
Created by: Engineeringmcs
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