Positively charged particles which are part of the nucleus of atoms.
Welding Tech
Demonstration that a fabricating process, such as welding, made by a specific procedure can meet given standards.
The detailed elements of a process or method used to produce a specific result.
The heating of parent metal prior to welding or cutting for the purpose of minimizing thermal shock and of slowing the cooling rate.
The temperature to which many of the low alloy steels must be heated before welding. Preheating retards the cooling rate, allowing more time for the hydrogen to escape, which minimizes under-bead cracking. Preheat temperatures can vary from 10øF to 500øF on «? sections to 300øF to 600øF on heavy sections, depending upon the alloy.