Write short note on:

a. Carbon arc welding

Mumbai University > Mechanical Engineering > Sem 3 > Production Process 1

Marks: 5M

Year: May 2016

• Carbon arc welding is one of the oldest welding techniques that are still in use today.
• The process of carbon arc welding uses low voltage, high amp electricity to heat the metal once an arc is formed between a carbon electrode and the piece being welded; if an arc is formed between two carbon electrodes that technique is known as a twin-carbon arc.
• The technique of single-carbon arc welding uses a direct current power supply which if required, filler rod may be used in Carbon Arc Welding. End of the rod is held in the arc zone. The molten rod material is supplied to the weld pool.
• Shields (neutral gas, flux) may be used for weld pool protection depending on type of welded metal. is connected using a straight polarity.

Advantages:

• Low cost of equipment and welding operation;
• High level of operator skill is not required;
• The process is easily automated;
• Low distortion of work piece.

Disadvantages:

• Unstable quality of the weld (porosity);
• Carbon of electrode contaminates weld material with carbides.