API

1 case · 2 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Condition: Welding Microstructure: Refined ferritic Capture method: Naked Eye or Stereoscope clear all

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Macrosection transverse to the longitudinal seam weld, presenting the two passes, the first welded from the internal side and the second welded from the external side. It is possible to see the columnar grains of the weld and the heat affected zone (HAZ) from each pass. See the schematic drawing in the next figure
427
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ML00053 / Mar.2017
SAW Longitudinal Seam of X70 Pipe
M - Microalloyed SteelP - Longitudinal Seam Welded PipeAp - SubseaCd - Welding
Cm - NItal Etched MacroDf - Welded Joint

More from these cases

ML00053 — SAW Longitudinal Seam of X70 PipeM - Microalloyed SteelP - Longitudinal Seam Welded PipeAp - SubseaCd - Welding
Micrography of the fusion line of the second pass (not reheated). The HAZ is bainitic and the weld metal presents columnar grains (of the previous austenite).
61
VIEW
ML00053 / Mar.2017
SAW Longitudinal Seam of X70 Pipe
M - Microalloyed SteelP - Longitudinal Seam Welded PipeAp - SubseaCd - Welding
Cm - NItal Etched MacroDf - Fusion Line