Which of the following arc welding methods is used for thin sheets as well as in difficult-to access positions?

Explanation:

Welding technology

• The stability of a DC arc with a consumable electrode depends largely on how the molten metal is transferred in the arc.
• One can be distinguished essentially between two different types of arcs, depending on material transport.
  1. Spray arc
  2. Short arc

Short arc welding

• The heat input from Short arc welding is low, which makes the process suitable for welding in thinner materials.
• The drops from the electrode dip into the weld pool.
• This can be repeated up to 200 times per sec.
• If the short circuit current is too high, it has a considerable effect on the pinch-off forces, causing weld spatter.
• Some means of limiting the short-circuit current must therefore be provided in the power unit, e.g. through the use of an inductor coil.
• It is not easy, with Short arc welding, to achieve a completely stable arc.
• The objective is to achieve a consistent, high short-circuiting frequency, resulting in small droplets being transferred to the workpiece and spatter droplets being so fine that they do not adhere to the workpiece.