Welding Questions and Answers – Weldability

This set of Welding Questions and Answers for Freshers focuses on “Weldability”.

1. Which of the following is not included in weldability?
a) Ability of mechanical soundness
b) Serviceability of joint
c) Strain relieving brittleness
d) Metallurgical compatibility of metal
View Answer

Answer: c
Explanation: For the making of good fabricated composition of a structure, metal with good weldability gets readily welded. Weldability includes the ability of the metal or the alloy to be having soundness in its mechanical properties, metallurgical compatibility of metal and serviceability of joint.

2. Which effect is not seen in alloys on weldability?
a) Control of ductile-malleable transformation temperature
b) Provision for oxidation to molten metal
c) Reduction in segregation
d) Grain refinement
View Answer

Answer: b
Explanation: On weldability, there are some effects seen in the alloying elements. Some of them are Control of ductile-malleable transformation temperature, Reduction in segregation, Grain refinement and provision for deoxidation to the molten metal.

3. On which of the following factor, does weldability not depend?
a) Boiling point
b) Melting point
c) Thermal expansion
d) Thermal conductivity
View Answer

Answer: a
Explanation: Weldability is dependent on five factors of the metal or alloying element. The factors being, melting point, thermal expansion, thermal conductivity, surface condition and change in the microstructure.
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4. Which of the following is not a way of correcting the metal which does not have good weldability properties?
a) Procedure of welding
b) Provision of fluxing material
c) Provision of filler material
d) Procedure of adding filler materials
View Answer

Answer: d
Explanation: When a particular metal or an alloy does not have desirable welding characteristics, then it can be corrected by proper fluxing material, correct filler material and a perfect welding procedure.

5. What does HAZ stand for?
a) Helium Aerated Zone
b) Heated Area Zone
c) Heat Affected Zone
d) Heat Allowed Zone
View Answer

Answer: c
Explanation: HAZ stands for Heat Affected Zone. This zone is generally the base of the metal or a thermoplastic material. This zone is not melted but the properties are altered by the welding process.

6. With an increase in the heat input of arc welding method, how does it affect the welding speed?
a) Increases
b) Decreases
c) Remains same
d) No relation
View Answer

Answer: b
Explanation: In arc welding processes, for calculating the efficiency, we use the formula for heat input. According to the formula, heat input is inversely related to the speed of welding, that is, with an increase in heat input, the welding speed decreases.

7. With an increase in the heat input of arc welding method, how does it affect the voltage applied?
a) Increases
b) Decreases
c) Remains same
d) No relation
View Answer

Answer: a
Explanation: None.
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8. With an increase in the heat input of arc welding method, how does it affect the required current?
a) Increases
b) Decreases
c) Remains same
d) No relation
View Answer

Answer: a
Explanation: None.

9. In fusion welding, welded pieces are kept together under pressure.
a) True
b) False
View Answer

Answer: b
Explanation: In fusion welding, the welded pieces are not kept under pressure, instead they are welded first and then allowed for some to cool down. It is in pressure welding, that the welded pieces are kept under pressure for some time.
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10. Materials having high thermal conductivity are difficult to melt.
a) True
b) False
View Answer

Answer: a
Explanation: Materials that have a medium melting point are considered to be welded easily and those materials which have their thermal conductivity very high are the toughest to be melted.

Sanfoundry Global Education & Learning Series – Welding.

To practice all areas of Welding for Freshers, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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