9 The Welding Process Flashcards
A joining procedure defined as the permanent union of metallic surfaces by establishing atom to atom bonds between the surfaces
Welding
Atomic cleanliness and closeness are essential in
Welding
Chemical cleaning in welding is also known as
Fluxing
Atomic closeness may be established by filling with a liquid metal, as in
Soldering and brazing
Most important welding processes, particularly those in which high strengths are a principal goal, make use of this in which the surfaces of the pieces to be joined are completely melted
Fusion bond
As in casting metallurgical changes and effects, such as grain size variation and shrinkage also occur in
Fusion welding
Weld defects will be concentrated in
The weld itself or the heat affected zone
Additional molten metal usually by continuously melting a rod or wire is called
Filler
Welding process with the filler material is a metal or alloy having a melting point above 800°F in a composition significantly different from the base metal
Braze welding
Designates a filler matetial similar to those used in braze welding but applied to a close fitting joint by preplacement or by a capillary action
Brazing
This method readily reveals unfilled joints and porosity
Radiography RT
An improper wetted and diffuse joint can be revealed by
Ultrasonics UT
Type of flow bonding where the melting temperature of the filler metal, is below 800°F
Soldering
Inducing deformation parallel to the interface while it is subject to high normal pressure is known as
Cold bonding
The cooling rate of the weld in the entire weld area can be lowered by
Preheat
