What is gas welding technique and oxygen cutting of metals and how is it performed in workshop? The usual gas welding techniques in oxy-acetylene welding are as follows:
1. Leftward or fore-hand welding:
In this method, the welding torch is held in the operator's right hand, the tip pointing towards the left and the weld is made from right to left. The torch makes an angle of 60° - 70° with the plate and the welding rod makes an angle of 30° - 40°. The plates above 6mm thickness are not economical to weld with this method.
2. Right-ward or back-hand welding:
In this method, the welding torch is held in the right hand and the filler rod in the left-hand. The welding begins at the left-hand end of the joint and proceeds towards the right. The torch makes an angle of 40° - 50° with the plate and the welding rod makes an angle of 30° - 40°. This method is better and economical for plates over 6 mm thickness.
3. Vertical welding:
The vertical welding may be carried out either by the left-ward technique or by the right-ward technique. The great advantage of vertical welding is that the plate edge preparation is not required up to 16 mm thickness.
4. Linde welding:
It is a special welding technique in which the use of oxy-acetylene flame with excess acetylene is made and the right-ward technique is used.
Gas or Oxygen Cutting of Metals
The cutting of iron and steel by using oxygen is extensively used now-a-days in industry. It is performed by an ordinary gas welding equipment, except that the welding torch is replaced by a cutting torch which consists of four openings.
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