Welding Flashcards
What is the definition of welding?
Joining of 2 or more materials by applying heat or pressure, or both, with or without filler material, to produce a localized union through fusion or recrystallization across the interface
Describe fusion welding
Parts are heated until they melt together, during this process fill metal may or may not be added
What are the 5 requirements of arc welding?
1) AC or DC current
2) Current carrying cable
3) Electrode holder
4) Electrode that carries an arc between electrode and the base material
5) Base material
What are the 5 types of weld joints?
1) Butt
2) Tee
3) Corner
4) Overlap
5) Edge
What temperature is produced by the arc?
3600 degrees Celsius
Describe how resistance welding works.
Heating by passing electric current through overlapping work pieces
Requires pressure but no filler
Limited to fairly thin sections
Describe solid state welding.
Requires pressure and sometimes heat is also used.
None of the materials are melted
Joining is accomplished in a solid state
Describe liquid solid state welding.
In liquid solid state welding:
1) The parts to be joined are heated but not melted
2) Dissimilar metal is added
3) Pressure is not a prerequisite
What are some examples of liquid solid state welding?
1) Brazing
2) Soldering
3) Braze Welding
What are the types of arc welding?
1) SMAW - Shielded Metal Arc Welding
2) GMAW - Gas Metal Arc Welding
3) GTAW - Gas Tungsten Arc Welding
4) FCAW - Flux Core Arc Welding
5) SAW - Submerged Arc Welding
6) PAW - Plasma Arc Welding
What welding processes do not use a consumable electrode?
1) Plasma Arc Welding
2) Electron Beam Welding
3) Gas Tungsten Arc Welding
What is the main difference, in terms of temperature, between brazing and soldering?
Brazing: melting temperature of filler material is above 450 degrees Celsius
Soldering: melting temperature of filler material is below 450 degrees Celsius
What is “buttering” and when is it used?
Buttering is used as a transition layer between 2 dissimilar metals. Buttering is typically applied on the base metal along the edges of the weld.
