The Applicability of the Standard DIN EN ISO 3690 for the Analysis of Diffusible Hydrogen Content in Underwater Wet Welding
Abstract
:1. Introduction
- Tensile stresses are present which approach the yield strength;
- The material features a microstructure that is susceptible to HIC;
- A critical amount of soluble hydrogen is present, which can diffuse within the lattice.
- Mercury method (HG): The hydrogen is collected in a Y-tube over a liquid in which it will not dissolve, usually mercury, at 25 °C ± 5 °C.
- Measurement with a thermal conductivity detector (TCD):
- ⚬
- Carrier gas hot extraction (CGHE) method: Hydrogen is extracted within a short period of time at a (suggested) temperature of 400 °C. The hydrogen is continuously collected and measured until all the diffusible hydrogen is quantified.
- ⚬
- Long-term desorption (LTD) method: The sample is placed in a suitable container, which is purged with inert gas and sealed against the atmosphere. The collection of hydrogen is done at lower temperatures (usually 45 to 100 °C) for longer time spans (as compared to CGHE).
- Glycerin method: This method works like the mercury method, but uses glycerin, which is not toxic. However, the method is not recommended to be used, since glycerin can solve hydrogen.
1.1. Normalization of Diffusible Hydrogen Content
- The diffusible hydrogen content HD represents the effused volume of hydrogen normalized by the weight difference of the specimen before and after welding. This means that the referenced mass is the deposited weld metal (Figure 1) and, thus, the unit of HD is mL/100 g of weld metal.
- The diffusible hydrogen content HF represents the effused volume of hydrogen normalized by the total mass of the molten material (Figure 1). This includes both the molten base metal and the deposited weld metal. To use HF, the penetration depth of the weldment must be known. This means that etched micrographs of every sample need to be evaluated (ideally from both sides, to see changes in the penetration profile). The proposed unit of HF is ppm (with respect to the mass of the molten material).
1.2. Number of Samples and Sample Dimensions
1.3. Time Periods Permitted for the Welding and Cleaning/Breaking Process
1.4. Time, Temperature, and Method Defined for the Analysis
2. Materials and Methods
2.1. Wet Welding Process
- Welding power source: AMT 400 E-UW (AMT GmbH, Aachen, Germany);
- Electrode: Aquaweld (DIN 2302-E 38 0 Z RB 2 UW 20 fr [32]) (Kjellberg Finsterwalde Elektroden und Zusatzwerkstoffe GmbH, Finsterwalde, Germany);
- Target arc voltage: 30 V;
- Welding current: 160 A;
- Welding speed: 0.20 m/min;
- Water depth: 0.5 m;
- Polarity: direct current (DC) minus;
- Base metal: S235JR (polished).
2.2. Normalization of the Measured Hydrogen Concentration
2.3. Welding of the Samples
2.4. Time Limitations Defined Regarding the Welding and Cleaning Process
2.5. Time, Temperature, and Method Defined for the Analysis
3. Results
3.1. Normalization of the Hydrogen Concentration
3.2. Time Limitations Defined Regarding the Welding and Cleaning/Breaking Process
3.3. Analyses Regarding the Sample’s Dimensions and the Number of Samples Welded Simultaneously
3.4. Time, Temperature, and Methods Defined for the Analysis
4. Discussion
4.1. Normalization of the Measurement Hydrogen Concentration
4.2. Time Limitations Defined Regarding the Welding and Cleaning/Breaking Process
4.3. Sample Dimensions and Time for Analysis
4.4. Analysis Temperature for CGHE
4.5. Analysis Method
4.6. Recommendations
5. Conclusions
- The time between the extinguishing of the arc and cooling in liquid nitrogen significantly influences the measured diffusible hydrogen content in welded samples.
- For DIN EN ISO 3690:2018 [9] sample C, up to three samples can be taken simultaneously in one welding step without significantly affecting the results.
- Different sample geometries need different timespans to release all the diffusible hydrogen during measurement. For DIN EN ISO 3690:2018 [9] sample C, 30 min at 400 °C is suitable.
- The hydrogen analysis methods using thermal conductivity detectors (long-term desorption and carrier gas hot extraction) differ in results. Long-term desorption leads to lower mean values.
Author Contributions
Funding
Conflicts of Interest
References
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Manufacturer | Designation of Electrode | Target Voltage | Abbreviation |
---|---|---|---|
Hydroweld Ltd. (Sutton Coldfield, UK) | Hydroweld FS | 28 V | FS |
Broco Inc. (Ontario, CA, USA) | Broco EasyTouch | 28 V | ET |
Broco Inc. (Ontario, CA, USA) | Broco SoftTouch | 28 V | ST |
ESAB AB (Göteborg, Sweden) | Arcair Sea-Weld | 33 V | SW |
Speciality Welds Ltd. (Rawfolds, UK) | Barracuda Gold | 31 V | BG |
Voestalpine Böhler Welding GmbH (Düsseldorf, Germany) | Phoenix Nautica 20 | 30 V | PN |
Kjellberg Finsterwalde Elektroden und Zusatzwerkstoffe GmbH (Finsterwalde, Germany) | Aquaweld | 30 V | AW |
Mean Value | Variance | |
---|---|---|
S1 | 71.75 | 16.65 |
S2 | 66.21 | 9.65 |
S3 | 54.13 | 5.93 |
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Klett, J.; Wolf, T.; Maier, H.J.; Hassel, T. The Applicability of the Standard DIN EN ISO 3690 for the Analysis of Diffusible Hydrogen Content in Underwater Wet Welding. Materials 2020, 13, 3750. https://doi.org/10.3390/ma13173750
Klett J, Wolf T, Maier HJ, Hassel T. The Applicability of the Standard DIN EN ISO 3690 for the Analysis of Diffusible Hydrogen Content in Underwater Wet Welding. Materials. 2020; 13(17):3750. https://doi.org/10.3390/ma13173750
Chicago/Turabian StyleKlett, Jan, Thomas Wolf, Hans Jürgen Maier, and Thomas Hassel. 2020. "The Applicability of the Standard DIN EN ISO 3690 for the Analysis of Diffusible Hydrogen Content in Underwater Wet Welding" Materials 13, no. 17: 3750. https://doi.org/10.3390/ma13173750