Only if it's considered "massive" like a very large piece 2" plate when your trying to put a small attachment weld on it.Hello, Why preheat Mild Steel, ????
Hello, Why preheat Mild Steel, ????
Hello, That is to Technical for me, when i started welding at 16, it was , Weld it up Boy so it wont fall apart That was nearly 60 years agoan example to measure the preheating temperature:
The determination of safe, but economic, preheating levels for the prevention of hydrogen cracking is critically dependent on an accurate knowledge of parent metal composition and carbon equivalent, CE, and on the weld metal composition
Carbon equivalent (CE) values for parent material are calculated using the following formula:
View attachment 439879
Clause C.2 is applicable to steels with a carbon equivalent (CE) in the range 0,30 to 0,70.
If, of the elements in this formula, only carbon and manganese are stated on the mill sheet for carbon and carbon manganese steels, then 0,03 should be added to the calculated value to allow for residual elements.
Where steels of different carbon equivalent or grade are being joined, the higher carbon equivalent value should be used.
This carbon equivalent formula may not be suitable for boron-containing steels.
Its probably to technical for a lot of usHello, That is to Technical for me, when i started welding at 16, it was , Weld it up Boy so it wont fall apart That was nearly 60 years ago