12 Questions
What is the most common defect caused by welding on contaminated metal?
Surface porosity
Why is mechanical cleaning important before welding?
To ensure quality welds by removing contaminants and oxides
What type of joint requires the least base metal edge preparation?
Lap joint
When might welders need to resort to chemical cleaning?
When mechanical cleaning is insufficient
What happens when metal is exposed to air for a prolonged period?
It develops surface porosity
Which type of weld is characterized by gas pockets or voids in the weld metal?
Plug or slot weld
What is the main purpose of surfacing in welding?
To increase the thickness of worn base metal
What is the maximum size allowed for the root opening and root face in open root welds on plate?
1/8"
What is the purpose of backing strips in welding?
To prevent contamination and support the weld pool
Which welding position is considered an in position weld?
Flat position
When welding a fillet weld, what letter is added to the back of the position?
F
What must be written for each weld if codes are mandated?
Welding procedure specification (WPS)
Test your knowledge on the importance of cleaning base metals before welding to ensure quality welds and conform to code requirements. Learn about the risks of welding on contaminated metal and the common defects caused by surface corrosion.
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