Welding: Principles and Applicatio...

8th Edition
Larry Jeffus
ISBN: 9781305494695



Welding: Principles and Applicatio...

8th Edition
Larry Jeffus
ISBN: 9781305494695
Textbook Problem

How long does it take the weld metal to go through its thermal cycle during a weld?

To determine

The time taken by the weld metal to undergo thermal cycle during weld.


Thermal cycle of a weld tells about the temperature variations around the location of weld. A weld undergoing thermal cycle helps in identifying the heating rate, the peak temperature. Thermal cycle also tells about the time required to reach the peak temperature. When the source of welding, i.e., arc or flames reach the welding zone, the temperature of specimen will increase. In the regime of cooling the temperature of specimen will decrease.

Every point away from weld centerline will have their own thermal cycle. The time taken by the weld metal will increase because the variation in distance of weld has decreased therate of heating, the peak temperature. Thus, the time consumed will increase and another parameter are also affected. The peak temperature will be lower than the actual peak temperature.

Other factors affecting the weld thermal cycle are: -

  1. Rate of heat input- Determines the time required for heating and cooling
  2. The amount of heat supplied- it tells about the height of peak temperature reached on the welding time versus temperature graph...

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