CSWIP 3.1 - Heat Input
Authored by abdur rasyid
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40 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Question 1.
Which of the following is the correct arc energy minimum and maximum, if the amps are (250-300), volts (25-28) and travel speed (250-300) mm/minute by MMA welding?
1,0 - 1,5 (kJ/mm)
1,0 - 1,6kJ/mm)
1,25 - 2,0 (kJ/mm)
1,5 - 2,0 (kJ/mm)
Answer explanation
The correct arc energy for MMA welding with the given parameters falls within 1,25 - 2,0 kJ/mm, as this range accounts for the specified amps, volts, and travel speed, ensuring optimal welding performance.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Question 1a.
With reference to the previous question and the correct answer, what the minimum
and maximum heat input?
1,0 - 1,5 (kJ/mm)
1,0 - 1,6 (kJ/mm)
1,25 - 2,0 (kJ/mm)
1,5 - 2,0 (kJ/mm)
Answer explanation
The correct choice, 1,0 - 1,6 (kJ/mm), indicates the range of heat input that is acceptable based on the previous question's context, ensuring it meets the specified criteria.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Question 2
During the MAG welding of a test piece for the purpose of approving a WPS the following parameters have been recorded: Amps 300, Volts 30, ROL 250mm, time 1 minute.
What is the heat input value?
1.808 KJ/mm.
2.055 KJ/mm.
1.728 KJ/mm.
2.16 KJ/mm.
Answer explanation
Heat input is calculated using the formula: Heat Input (KJ/mm) = (Volts x Amps x Time) / (60 x ROL). Substituting the values: (30 x 300 x 1) / (60 x 250) = 1.728 KJ/mm. Thus, the correct answer is 1.728 KJ/mm.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Question 3.
The specimen for hardness test shall be taken from which of position when doing the welding HL045?
PB
PA
PE
PC
Answer explanation
The hardness test specimen for welding HL045 should be taken from position PE, as this area is critical for assessing the weld's mechanical properties and integrity.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Question 3a.
With reference to the above question and the correct answer, what is the reason?
Highest heat input
Lowest heat input
K=1
K=0.8
Answer explanation
The correct answer is 'Lowest heat input' because lower heat input typically leads to more efficient energy use and reduced thermal stress, making it the preferred choice in many applications.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Question 4
What is the thermal efficiency factor of SAW?
k=1,0 (AE= HI)
k=0.8
k=0,5
k=0,6
Answer explanation
The thermal efficiency factor of SAW is represented as k=1.0 (AE= HI), indicating maximum efficiency. Other options like k=0.8, k=0.5, and k=0.6 represent lower efficiencies, making k=1.0 the correct choice.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Question 4a.
With reference to the above question and the correct answer, what is the definition of thermal efficiency factor:
Efficiency factor is Arc energy x 100% / Heat input
Efficiency factor is Heat input x 100% / Arc energy
Efficiency factor is Heat input / Arc energy
Efficiency factor is arc energy / heat input
Answer explanation
The correct definition of thermal efficiency factor is 'Heat input x 100% / Arc energy'. This formula indicates how effectively the heat input is converted into useful arc energy.
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