Question

91. What are the essential differences between arc welding and resistance welding ?

2. Essential differences between brazing and fusion welding?

3. Explain the basic principles of arc welding processes

4. Why arc welding is called stick welding

5. can arc welding be used to join plastic materials? explain

6. What is a flux

7. What are the purposes of using flux?

8. Flux can be used in which joining processes

9. What are the disadvantages of using flux

10. What are the advantages of mechanical fastening

Answer 1

1. In arc welding, heat is used to join the metal whereas in resitance welding pressure is also included to join the metal. Arc welding is used to join thicker plates whereas resistance welding is used to join thiiner plates.

2. Fusion welding melts base metal. In brazing, filler metal is melted during brazing and it is used to join the parts.

3. Arc welding is a process in which heat is generated by an electric arc between an electrode and the base metal. Electric arc between the electrode and base metal closes the electric circuit. The arc temperature may reach upto 6000 C, which is sufficient for melt the work piece and join them.

4. Arc welding which uses a consumable electrode covered with flux to lay a weld is called Shielded Metal Arc Welding or simply Stick welding. If the electrode is held at a perpendicular angle to the workpiece the tip will likely stick to the metal which will fuse the electrode to the workpiece.