Question

Spot welding is used for:

• A. Thin metal sheets
• B. Thick metal rods
• C. Thick square sections
• D. Rough and irregular surfaces

Hint:

Spot welding is ideal for thin metal sheets in industries like automobile and electronics due to its high-speed operation and low material distortion.

Answer 1

The Correct Option is A

Step 1: What is Spot Welding? Spot welding is a type of resistance welding used to join two or more metal sheets together by applying pressure and electrical current. It is commonly used in automobile, aerospace, and sheet metal industries. 
Step 2: Why Thin Metal Sheets? - Spot welding works best for thin metal sheets (typically 0.5 mm to 3 mm thick).
- It creates localized heat at the weld points using high current, causing the sheets to fuse. 
Step 3: Evaluating options: 
- (A) Correct: Spot welding is primarily used for thin metal sheets.
- (B) Incorrect: Thick metal rods require arc welding or friction welding.
- (C) Incorrect: Thick square sections need MIG/TIG welding for strong joints.
- (D) Incorrect: Rough or irregular surfaces are difficult to weld using spot welding.