Welded Joint

3 cases · 9 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Austenite Standard: UNS Capture method: Scanning Electron Microscope clear all

Welded Joint — sub-branches

Cladding 1Fabrication Weld 3Welded Testpiece for Qualification 1

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Scanning electron microscopy image of the external surface of the line at the cracking position showing multiple cracks, branched, transverse to the line axis.
79
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - External Surface
Image by scanning electron microscopy of the metallurgically bonded interface of the composite seamless tube (carbon steel externally claded with stainless steel), in the side of the stainless steel where a strain hardening effect plus a carbide precipitation in twins is shown. The hardness of this region (279 HV0.3) is a lot higher than the value obtained out of this region (167 HV0.3) for the same stainless steel.
814
VIEW
ML00056 / May.2018
Seamless Tube Externally Cladded with SS
M - Carbon Steel / Stainless SteelP - CladdingAp - Pulp and PaperCd - Removed From Service
Cm - Electrolytic Etch Micrography by SEMDf - Clad Interface
Fracture surface after opening the shell cracking, presenting fatigue striation. The fracture presents also foreign particles.
132
VIEW
ML00050 / Nov.2017
Fatigue Failure of a 316SS Pressure Stabilizer
M - Austenitic Stainless SteelP - Fabrication WeldAp - Chemical IndustryCd - Mechanical Fatigue
Cm - Fractography by SEMDf - Fatigue Striation

More from these cases

ML00095 — MIC of a Riser Control LineM - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Detail, by scanning electron microscopy, of the external surface of the line at the cracking position presenting branched cracks, transverse to the line axis. The surface of the fitting is fully stained (dark grey), from where the cracks start, indicating that the material loose passivation in these regions.
62
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - Branched Cracks
The aspect of the fitting surface by SEM shows multiple cracks. Interesting to observe a stained region (dark grey) that corresponds to regions where the material passivation was destroyed.
43
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - External Surface
Detail of one region that had the passivation layer destroyed .
45
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - External Surface
Detail of one region that had the passivation layer destroyed and presented corrosion cracks.
48
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - Corrosion Cracking
The aspect of the external surface of the fitting shows regions where the passivation was lost and where microcracks started already.
54
VIEW
ML00095 / Sep.2017
MIC of a Riser Control Line
M - Austenitic Stainless SteelP - Fabrication WeldAp - Oil and GasCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - Microcracks
ML00056 — Seamless Tube Externally Cladded with SSM - Carbon Steel / Stainless SteelP - CladdingAp - Pulp and PaperCd - Removed From Service
The scanning electron microscopy image details the strain hardened layer with carbide precipitation at twins, in the stainless steel side very close to the interface.
81
VIEW
ML00056 / May.2018
Seamless Tube Externally Cladded with SS
M - Carbon Steel / Stainless SteelP - CladdingAp - Pulp and PaperCd - Removed From Service
Cm - Electrolytic Etch Micrography by SEMDf - Strain Hardened