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A welding operation is being performed with voltage = 30 V and current = 100 A. The cross-sectional area of the weld bead is 20 mm2 . The work-piece and filler are of titanium for which the specific energy of melting is 14 J/mm3. Assuming a thermal efficiency of the welding process 70%, the welding speed (in mm/s) is __________ (correct to two decimal places).
    Correct answer is '7.5'. Can you explain this answer?
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    A welding operation is being performed with voltage = 30 V and current...
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    A welding operation is being performed with voltage = 30 V and current...
    Given data:
    - Voltage (V) = 30 V
    - Current (I) = 100 A
    - Cross-sectional area of the weld bead (A) = 20 mm2
    - Specific energy of melting (E) = 14 J/mm3
    - Thermal efficiency (η) = 70%

    Calculation:

    Step 1: Calculate the power (P) used during welding:
    - Power (P) = Voltage (V) x Current (I)
    - P = 30 V x 100 A
    - P = 3000 W

    Step 2: Calculate the heat input (Q) during welding:
    - Heat input (Q) = Power (P) x Time (t)
    - As we don't have the value of time, we cannot directly calculate the heat input.

    Step 3: Calculate the heat generated per unit volume (Q/V):
    - The cross-sectional area of the weld bead (A) = 20 mm2
    - Assuming the length of the weld bead is 1 mm (for simplicity),
    - Volume (V) = Cross-sectional area (A) x Length (L)
    - V = 20 mm2 x 1 mm
    - V = 20 mm3

    Step 4: Calculate the heat generated (Q) per unit volume (Q/V):
    - Heat generated per unit volume (Q/V) = Heat input (Q) / Volume (V)
    - Q/V = Q / 20 mm3

    Step 5: Calculate the heat generated (Q) per unit volume (Q/V) in J/mm3:
    - The specific energy of melting (E) = 14 J/mm3
    - Q/V = 14 J/mm3

    Step 6: Calculate the heat input (Q) using the heat generated per unit volume (Q/V):
    - Q/V = Q / 20 mm3
    - Q = Q/V x 20 mm3
    - Q = 14 J/mm3 x 20 mm3
    - Q = 280 J

    Step 7: Calculate the actual heat input considering the thermal efficiency:
    - Actual heat input = Q / Thermal efficiency (η)
    - Actual heat input = 280 J / 0.70
    - Actual heat input = 400 J

    Step 8: Calculate the welding speed (Vw):
    - Heat input (Q) = Power (P) x Time (t)
    - Time (t) = Q / P
    - Time (t) = 400 J / 3000 W
    - Time (t) = 0.1333 s

    - Welding speed (Vw) = Length (L) / Time (t)
    - As we assumed the length of the weld bead as 1 mm,
    - Welding speed (Vw) = 1 mm / 0.1333 s
    - Welding speed (Vw) ≈ 7.5 mm/s

    Therefore, the welding speed is approximately 7.5 mm/s.
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    A welding operation is being performed with voltage = 30 V and current = 100 A. The cross-sectional area of the weld bead is 20 mm2 . The work-piece and filler are of titanium for which the specific energy of melting is 14 J/mm3. Assuming a thermal efficiency of the welding process 70%, the welding speed (in mm/s) is __________ (correct to two decimal places).Correct answer is '7.5'. Can you explain this answer?
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    A welding operation is being performed with voltage = 30 V and current = 100 A. The cross-sectional area of the weld bead is 20 mm2 . The work-piece and filler are of titanium for which the specific energy of melting is 14 J/mm3. Assuming a thermal efficiency of the welding process 70%, the welding speed (in mm/s) is __________ (correct to two decimal places).Correct answer is '7.5'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A welding operation is being performed with voltage = 30 V and current = 100 A. The cross-sectional area of the weld bead is 20 mm2 . The work-piece and filler are of titanium for which the specific energy of melting is 14 J/mm3. Assuming a thermal efficiency of the welding process 70%, the welding speed (in mm/s) is __________ (correct to two decimal places).Correct answer is '7.5'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A welding operation is being performed with voltage = 30 V and current = 100 A. The cross-sectional area of the weld bead is 20 mm2 . The work-piece and filler are of titanium for which the specific energy of melting is 14 J/mm3. Assuming a thermal efficiency of the welding process 70%, the welding speed (in mm/s) is __________ (correct to two decimal places).Correct answer is '7.5'. Can you explain this answer?.
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