Joining Technology - 230330 Flashcards
1
Q
What is the usual temperature of steel in the center of a weld spot?
A
Around 1800 degrees Celsius.
2
Q
Describe the process of resistance projection welding
A
A bottom sheet metal is plastically deformed by a “cup” shape in the electrode, which also heats both surfaces by flowing current and melts the metal in both surfaces.
The result is a cup shape in both surfaces that is actually the welding point.
ISO 8167
3
Q
What’s the dependance between Carbon content in steel and weldabiity
A
Above 0.4 Carbon leads to martennsitic structrues and cracking in the heat affected area.
4
Q
Dependance on current and the shear strength
A
If you increase the welding current, the nugget size increases and the strength in shear tests increases also.
