No, not for critical applications (petrochemical, nuclear). The oxide is brittle and can initiate cracking. For CSWIP 3.1 criteria, it indicates poor technique. Remedy: Increase post-gas flow, reduce torch travel speed, or use a gas purge (backing gas) inside the pipe.
Basic (e.g., E7018). These are designed to produce low-hydrogen weld metal. cswip 3.1 technology questions and answers
Describe hydrogen-induced cold cracking (HICC) – where does it occur and what three factors are required? A: Occurs in the HAZ or weld metal after cooling (several hours post-weld). Three factors: No, not for critical applications (petrochemical, nuclear)
In RT (radiography), what does a darker area on the film mean? A: Greater radiation reached the film → less material thickness (e.g., porosity, root penetration gap, internal undercut). Remedy: Increase post-gas flow, reduce torch travel speed,
| Feature | Slag Inclusion | Tungsten Inclusion | | :--- | :--- | :--- | | | Less dense than parent metal (appears darker on X-ray). | Much denser than parent metal (appears brighter white). | | Shape | Irregular, jagged, often elongated. | Round, spherical, or sharp specks. | | Location | Between weld passes (stringers) or at the toe. | Typically trapped in GTAW root or hot pass. | | Cause | Poor inter-run cleaning. | Touching tungsten to molten pool or high current. |