The recommended configuration for soldering is:

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ALP CBT 2 Electrician Previous Paper: Held on 23 Jan 2019 Shift 2
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  1. Wave joint
  2. Butt joint
  3. Lap joint
  4. Scarf joint

Answer (Detailed Solution Below)

Option 3 : Lap joint
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Both brazing and soldering are the metal joining processes in which parent metal does not melt but only filler metal melts filling the joint with capillary action.

Joint Design

a) Lap joint is the recommended form for these assemblies. Generally, the area of overlap in the joint is kept large in order to make it stronger than the weakest member of the assembly.

It is the recommended configuration for soldering. 

A common thumb rule: Allow an overlap of at least three times the thickness of the thinnest member.

RRB JE ME 27 15Q Welder 2 HIndi - Final images Q13

b) Butt joints are avoided as they are weak due to small joint areas. They are not recommended unless strength requirements are very low and there is no need for a pressure seal at the joint.

RRB JE ME 27 15Q Welder 2 HIndi - Final images Q13a

c) Scarf Joint: To provide a greater joint area, scarf joints are recommended.

RRB JE ME 27 15Q Welder 2 HIndi - Final images Q13b

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