Welding Processes
A Brief History of Welding
Late
19th Century
Scientists/engineers apply advances in
electricity to heat and/or join metals (Le Chatelier, Joule, etc.)
Early
20th Century
Prior to WWI welding was not trusted as a method
to join two metals due to crack issues
1930’s
and 40’s
Industrial welding gains acceptance and is used
extensively in the war effort to build tanks, aircraft, ships, etc.
Modern
Welding
the nuclear/space age helps bring welding from
an art to a science
Weldability of a Metal
Metallurgical
Capacity Parent metal will join with the weld metal
without formation of deleterious constituents or alloysMechanical
SoundnessJoint will be free from discontinuities, gas
porosity, shrinkage, slag, or cracksServiceabilityWeld is able to perform under varying conditions
or service (e.g., extreme temperatures, corrosive environments, fatigue, high
pressures, etc.)
Metallurgical Capacity Parent metal will join with the weld metal without formation of deleterious constituents or alloysMechanical SoundnessJoint will be free from discontinuities, gas porosity, shrinkage, slag, or cracksServiceabilityWeld is able to perform under varying conditions or service (e.g., extreme temperatures, corrosive environments, fatigue, high pressures, etc.)
Fusion Welding Principles
# Base metal is melted
# Filler metal may be added
# Heat
is supplied by various means
# Oxyacetylene gas
# Electric Arc
# Plasma Arc
# Laser
