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Welding Surface Preparation Quiz

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Questions and Answers

What is the most common defect caused by welding on contaminated metal?

Surface corrosion

Cracks

Surface porosity (correct)

Toxic fumes

Why is mechanical cleaning important before welding?

To prevent metal from getting too hot

To create designs on the metal surface

To ensure quality welds by removing contaminants and oxides (correct)

To remove toxic fumes

What type of joint requires the least base metal edge preparation?

Lap joint (correct)

Corner joint

T-joint

Edge joint

When might welders need to resort to chemical cleaning?

When mechanical cleaning is insufficient Signup and view all the answers

What happens when metal is exposed to air for a prolonged period?

It develops surface porosity Signup and view all the answers

Which type of weld is characterized by gas pockets or voids in the weld metal?

Plug or slot weld Signup and view all the answers

What is the main purpose of surfacing in welding?

To increase the thickness of worn base metal Signup and view all the answers

What is the maximum size allowed for the root opening and root face in open root welds on plate?

1/8" Signup and view all the answers

What is the purpose of backing strips in welding?

To prevent contamination and support the weld pool Signup and view all the answers

Which welding position is considered an in position weld?

Flat position Signup and view all the answers

When welding a fillet weld, what letter is added to the back of the position?

F Signup and view all the answers

What must be written for each weld if codes are mandated?

Welding procedure specification (WPS) Signup and view all the answers