Which of the following statements describes a desirable material property for metals used in forming operations?
high strength and toughness
low strength and high ductility
high strength at elevated temperatures
high hardness and low coefficient of friction
all of the above
a tensile test is performed on a plain carbon steel. the steel has a strength coefficient (k) and a work hardening exponent (n) of 1350 mpa and 0.4, respectively. calculate the average flow stress in mpa if the gage length is stretched from 50 mm to 80 mm. answers are rounded to 2 decimal places (x. xx).
0.58
786.08
712.93
998.10
none of the above
which of the following are advantages associated with hot working processes?
good surface finish
the strength properties are generally isotropic.
strain hardening increases the strength and hardness
the work part shape can be significantly altered without annealing.
b and d above
a and b above
arc welding, brazing, and soldering are methods that can be used to join metal components. which of the follow statements are reasons that you would use brazing or soldering to join two metal parts instead of arc welding?
the geometry of the joint is complex
high strength is required.
similar metals, such as two steel alloys are to be joined.
one or more of the metals has poor weldability
all of the above
a and d above