# Welding Questions and Answers – Solid State Welding

This set of Welding online test focuses on “Solid State Welding”.

1. At what temperature, does fusion welding takes place?
a) 850°C
b) 900°C
c) 950°C
d) 1000°C

Explanation: The process of fusion welding can be used for joining metal to a metal or a metal can be joined to a ceramic. For the joining of this process, a temperature of 900°C is provided for the approach.

2. Which of the following is not a type of diffusion welding?
a) Gas-pressure welding
b) Vacuum fusion welding
c) Eutectic fusion bonding
d) Eutectoid fusion welding

Explanation: Diffusion welding is has three basic techniques which are incorporated by it. These three basic techniques are, gas – pressure welding, vacuum fusion welding and eutectic fusion welding.

3. What is the minimum frequency used in ultrasonic welding?
a) 10,000 Hz
b) 20,000 Hz
c) 30,000 Hz
d) 40,000 Hz

Explanation: The process of ultrasonic welding is mainly used for the joining of similar metals or dissimilar metals using vibration energy, by way of high frequency. The minimum frequency needed for this purpose is 20,000 Hz.

4. What is the maximum frequency used in ultrasonic welding?
a) 30,000 Hz
b) 40,000 Hz
c) 50,000 Hz
d) 60,000 Hz

Explanation: None.

5. In what conditions are the parts kept before welding in ultrasonic welding method?
a) Low static pressure
b) High static pressure
c) Low moving pressure
d) High moving pressure

Explanation: In ultrasonic welding method, the parts which are to be joined, are kept clamping to one another in between of supporting member and the welding tip. This clamping is done at a low static pressure.
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6. What is the maximum thickness that can be welded in ultrasonic welding?
a) 1.8 mm
b) 2.1 mm
c) 2.3 mm
d) 2.5 mm

Explanation: Weldings such as spot welding or continuous seam welding can be done through ultrasonic welding. The maximum thickness that can be achieved varies depending on the metal. The maximum thickness can be that can be welded is 2.5mm.

7. Electric currents are passed is ultrasonic welding.
a) True
b) False

Explanation: In ultrasonic welding method, the parts which are to be joined, are kept clamping to one another in between of supporting member and the welding tip. In doing this, no current is required to be passed through the metal, and usually, no heat is needed for this too.

8. What is the minimum thickness that can be welded in ultrasonic welding?
a) 0.58 mm
b) 0.21 mm
c) 0.38 mm
d) 0.92 mm

Explanation: None.

9. Which of the following is not a factor for explosive welding?
a) High relative velocity
b) Less amount of plastics
c) Proper orientation
d) High pressure

Explanation: While considering for explosive welding, the factors that one needs to understand is that, there has to be high relative velocity. There should be proper orientation and it needs to be kept under high amount of pressure.

10. ‘α’ is the angle between target plate and flyer plate.
a) True
b) False

Explanation: The workpiece which has its position fixed is called as the target plate and the other plate is called as flyer plate. The distance between the two plates is denoted by ‘d’ and the angle between them is denoted by ‘α’.

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