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MTM0070 Materials engineering

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Calculate the welding current. For the first weld calculate the minimum requirement. Note that the material is galvanized steel, adjust the current accordingly.

Transform the calculated current to the % of machine’s nominal current (this was 10.2 kA)

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Calculate the pressure on the electrodes (minimum requirement, in bars). 

Allowed error 10%, use "." as decimal separator.

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Knowing the material thickness and type, fill the Table in your report and find the following welding parameters from given literature recommendations (Table 1 in the guide).

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Which of these other defects can you notice on the cast part?

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Calculate

drop height (

H

) of the drop forging

hammer for the first sample (deformation degree

ε1 = 10%)

, where the hammer should be lifted in order for the test piece to upset

from initial height

h0

to

final height

h1.

Check your answer below (error 5-10% allowed). You can give the answer in millimeters, centimeters or meters - just check the feedback for confirmation of correct units. If you wish to use decimal separator, use "."

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Calculate

drop height (

H

) of the drop forging

hammer for the third sample (deformation degree

ε1 = 30%)

, where the hammer should be lifted in order for the test piece to upset

from initial height

h0

to

final height

h1.

Check your answer below (error 5-10% allowed). You can give the answer in millimeters, centimeters or meters - just check the feedback for confirmation of correct units.

View this question

Calculate

drop height (

H

) of the drop forging

hammer for the second sample (deformation degree

ε1 = 20%)

, where the hammer should be lifted in order for the test piece to upset

from initial height

h0

to

final height

h1.

Check your answer below (error 5-10% allowed). You can give the answer in millimeters, centimeters or meters - just check the feedback for confirmation of correct units.

View this question

Which sheet forming operations were used in the manufacturing process of the product shown in the figure?

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Which sheet forming operations were used in the manufacturing process of the product shown in the figure?

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Calculate clearance between the steel punch and the die z (mm). The material thickness is 1.3 mm, tensile strength 490 MPa, and the type of punch-dependent factor k is 0.01.

where  k – punch material-dependent factor

        s – material thickness, mm;

        Rm - tensile strength, MPa;

         tau 1 (τ1) – material shear strength (τ1= Rm x 0.8), MPa.

Provide the answer in millimeters with accuracy of three decimal places. Use "." as decimal separator.

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