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Glossary

ASME IX
ASME Section IX is a section in the American Society of Mechanical Engineers specification which refers to the testing of welding and brazing procedures and also the testing of welders and brazing operators. It is sometimes called up in this country particularly on oil industry and offshore related work.

CO2 WELDING
This is another name for the MAG process and originated when CO2 gas was used for welding on steels with this process.

EN 287 and BS EN ISO 9606
These are the European Standards which refer to the testing of welders for Steels and Aluminium and its Alloys.

BS EN ISO 15614
These are European Standards which refer to the qualification of Welding procedures.

D.P.I.
Dye Penetrant Inspection uses a penetrating ink and a developer in order to locate surface imperfections on both ferro magnetic and non ferrous materials.

GMAW
American abbreviation for MIG/MAG

GTAW
American abbreviation for TIG

MIG/MAG
Metal Inert or Active Gas Welding. Both processes are often called ‘MIG welding’ but this is only truly correct when the shielding gas used is completely inert. When an active gas such as CO2 or an inert gas such as argon plus a percentage of CO2 are used the process should be called ‘MAG welding’.

MMA
Manual Metal Arc Welding. Process sometimes called ‘stick’ welding because of flux coated consumable electrode used.

M.P.I.
Magnetic Particle Inspection uses magnetism in order to locate surface imperfection on ferro magnetic materials.

OXY/ACETYLENE
Flame produced by burning oxygen and acetylene gas used as heat source to melt material to be welded.

RADIOGRAPHIC EXAMINATION
Uses X-rays or Gamma rays in order to locate internal faults.

SMAW
American abbreviation for MMA

SUBMERGED ARC
Submerged Arc Welding is nothing to do with welding under water as many people seem to think. It is a process similar to MIG/MAG but instead of a gas being used to shield the arc the arc is submerged in a flux powder.

TIG
Tungsten Inert Gas Welding. A process using a non-consumable tungsten electrode as a heat source and shielded from the atmosphere by shrouding the arc in either argon or helium gas.

U.T.
Ultrasonic Testing uses the distance travelled by sound waves (pulse/echo) in order to locate internal faults.