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Advantages, Disadvantages and Applications of Plasma Arc Welding
Advantages Disadvantages and Applications of Plasma Arc Welding -
Advantages
Some of the advantages of plasma arc welding in addition to those mentioned under section 4.11.9 are listed below:
1. Stability of arc.
2. Uniform penetration.
3. Simplified fixtures.
4. Rewelding of the root of the joint saved.
5. It is possible to produce fully penetrated keyhole welds on pieces upto and about 6 mm thick with square butt joint.
6. Excellent weld quality.
7. Plasma arc welding can produce radiographic quality welds at high speeds.
8. It can weld steel pieces up to about one half inch thick; square butt joint in single run with no filler metal addition.

Disadvantages
1. Infrared and ultraviolet radiations necessitate special protection devices.
2. Welders need ear plugs because of unpleasant, disturbing and damaging noise.
3. More chances of electrical hazards are associated with this process.
4. The process is limited to metal thickness of 25 mm and lower for butt welds.
5. Plasma arc welding process and equipment are more complicated and require greater knowledge on the part of the welder as compared to TIG welding.
6. Inert gas consumption is high.

Applications
Plasma arc welding finds applications as follows:
1. Single runs autogenous and multi-run circumferential pipe welding.
2. in tube mill applications.
3. Welding cryogenic, aerospace and high temperature corrosion resistant alloys.
4. Nuclear submarine pipe system (non-nuclear sections, sub assemblies).
5. Welding steel rocket motor cases.
6. Welding of stainless steel tubes (thickness 2.6 to 6.3 mm).
7. Welding of carbon steel, stainless steel, nickel, copper, brass, monel, inconel, aluminium, titanium, etc.
8. Welding titanium plates up to 8 mm thickness.
9. Welding nickel and high nickel alloys.
10. for melting, high melting point metals.
11. Plasma torch can be applied to spraying, welding and cutting of difficult to cut metals and alloys.

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