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· Diagram (a) shows the position
dependence of the maximum temperature in the hypoeutectoid carbon
steel
material being joined by welding.
· The
Temperature distribution changes the microstructure of the material
(b), and near the butt-weld turns it to liquid during the welding process.
· The final microstructure depends
on the weld cooling rate. In (c) the room temperature micro-structure for
a low cooling rate is shown.
· In
(d) the room temperature micro-structure that results from a high cooling
rate is illustrated.
· This
last weld is brittle due to its high
martensite content.
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