WELDING

Gap-fill exercise

  
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is useful in making permanent joints.

Plastic welding is also known as welding.

No pressure is applied in this method. Hence, it is also known as pressure less welding or welding.

1. In welding, the edgesof two metal parts are melted by an electric arc and the joint is made.

2. In manual welding, the size of the electrode changes according to the of the metal parts.

3. electrodes areused in the processes of atomic hydrogen welding and TIG welding.

4. welding is the process of melting and joining metal parts by means of a gas flame.

5. Oxygen and gases are made to pass through the welding torch.

6. rod provides the additional metal required for making the joint.

7. Oxygen and acetylene gases are stored in separate and used for gas welding.