Selection of Interpass Temperature for Welding Layers
Interpass temperature is an essential factor to be considered while welding two layers together by a process like MIG/MAG welding. In this process, the heat generated while welding is transferred to the metal layers being joined. The interpass temperature is the temperature of the metal layers during the process of welding. It is the temperature of the metal at the end of the weld pass and the beginning of the next. It is important to select an appropriate interpass temperature to ensure a successful weld.
Interpass temperature is affected by many factors. The welding amperage and the size of the metal layers being joined are two of the main ones. Higher current will result in a higher interpass temperature, and larger metal layers will also increase the interpass temperature. Other factors such as welding speed, arc length, and backing strip affect the interpass temperature as well. It is important to account for all of these factors when selecting an interpass temperature.
If the interpass temperature is too high, it can cause several welding problems. Excessive heat can cause thermal distortions in the metal layers, which can affect the quality of the weld. High temperatures can also result in faster penetration and molten metal splattering. On the other hand, if the interpass temperature is too low, it can cause welding problems such as cold-shortening, solidification cracking, and lack of fusion.
To prevent these problems from occurring, it is important to select an appropriate interpass temperature. It is generally recommended that the interpass temperature should not exceed 250°C. This is because higher temperatures can result in weld pool variability and poor fusion. Lower temperatures are also generally recommended as they can help reduce the risk of thermal stresses.
The selection of an appropriate interpass temperature can be difficult as there are many factors to consider. It is important to understand the factors that affect the interpass temperature and how to account for them. It is also important to understand the welding process and the equipment being used. Having a good understanding of the process will allow the user to select the correct interpass temperature that is appropriate for their application.
Overall, it is important to select an appropriate interpass temperature to ensure successful welding. It is important to account for all of the factors that can influence the interpass temperature, and to understand the welding process being used. If the correct interpass temperature is selected, this will help reduce the risk of welding problems and ensure a successful weld.
