When spot radiography is used in place of ultrasound on ESW or EGW welds to find piping porosity, how long should the film for each spot be?

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Study for the CSA Welded Steel Construction – Metal Arc Welding (W59) Welding Inspector Level 1 Test. Prepare with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

When spot radiography is used in place of ultrasound on ESW or EGW welds to find piping porosity, how long should the film for each spot be?

Explanation:
Spot radiography inspects a defined length of the weld to reliably reveal porosity. If the film only covers a small portion, porosity could lie outside the exposed area and be missed. Using a film length of at least 100 mm (4 inches) provides a representative segment of the ESW/EGW weld for each exposure, increasing the chance that any porosity present will appear on the radiograph. This length balances effective coverage with efficiency, since shorter spots risk missing defects and longer spots don’t add necessary information beyond the required coverage.

Spot radiography inspects a defined length of the weld to reliably reveal porosity. If the film only covers a small portion, porosity could lie outside the exposed area and be missed. Using a film length of at least 100 mm (4 inches) provides a representative segment of the ESW/EGW weld for each exposure, increasing the chance that any porosity present will appear on the radiograph. This length balances effective coverage with efficiency, since shorter spots risk missing defects and longer spots don’t add necessary information beyond the required coverage.

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