What are some of the surface impurities that can contaminate a weld and cause porosity?
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Q3: All welds have discontinuities and flaws, but
Q4: Overlap is also referred to as _.
Q5: The localized hardening of an arc strike
Q6: _ are the result of internal stresses
Q7: _ are foreign objects not melted by
Q9: What is the difference between spherical porosity
Q10: A _ is anything that is not
Q11: Why may weld testing be delayed for
Q12: Cylindrical porosity is often called a _.
Q13: _ become defects when they accidentally occur
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