Coded welding is used in all aspects of welding for commercial and industrial sectors. Once you have qualified as a coded welder, then regular assessment and testing will take place to ensure your welding is up to scratch.
The welds must be tested once finished to ensure they are completed to a high standard and fit for purpose, this is the first step in coded welding. There are many different types of testing including NDT testing (Non-Destructive Test) where a 5% weld inspection is common. X-ray is another common form of testing as this can show any cracks or other imperfections in the welds themselves.
In the UK welder approval is done to BS EN standards in the USA the standards are ASME IX.
To become a multi-coded welder each specification requires testing and examining, if every specification is passed then the welder is multi-coded.
There are various types of welding these include TIG, MIG, MMA and fusion welding.
TIG welding (Gas Tungsten Arc Welding) is often considered to be a difficult method as it requires a lot of coordination by the welder. Two hands are required to complete the welding as a filler metal is used in one hand while the welding torch is in the other.
MIG welding (Gas Metal Arc Welding) is the most common type of welding in industry today due to its versatility and ease of use.
MMA welding (Shielded Metal Arc Welding) also known as stick welding is a type of welding which uses an electrode covered with flux to lay the weld. The flux is there to give off vapours which then serve as a shielding gas.