Manufacturing and Use of Spiral Welded Pipes for High Pressure Service: State of the Art

2004 ◽  
Author(s):  
Franz Martin Knoop ◽  
Baldur Sommer
Keyword(s):  
High Pressure ◽  
Arc Welding ◽  
State Of The Art ◽  
Modern Technology ◽  
Pipe Production ◽  
Cold Bending ◽  
Site Field ◽  
Hot Rolling Mill ◽  
Service State ◽  
Submerged Arc

The HTS (Helical Seam Two Step) manufacturing process is used for the production of HSAW-pipes for high pressure service since 1987. The production process is split into pipe forming combined with continuous tack welding followed by submerged arc welding. The process has been continuously developed further. Details of this modern technology are described and qualitative and economical advantages over the conventional process are explained. The benefits of the existing network with steel plant and hot rolling mill as well as the quality controls, process automatisation and new NDT-equipment used in the pipe production are highlighted. Statistics on mechanical, chemical and dimensional properties of HTS pipes are presented to furnish proof of the uniform and well balanced profile of this product. Results from hot and cold bending on site, field weldability trials and tests related to the safety of spiral pipes are discussed. Results and experiences with the application of three-layer coatings (especially HDPE-high density polyethylene) on spiral pipes are also presented. Actual examples for the use and application of spiral welded pipes in international gas and oil projects are presented and an outlook on future development trends is given.

Design of Experiment of High Pressure Steel Tank Using Tandem Submerged Arc Welding

2016 ◽  
Vol 848 ◽  
pp. 11-14
Author(s):  
Prin Boonkanit ◽  
Wittaya Pansong
Keyword(s):  
High Pressure ◽  
Arc Welding ◽  
Travel Speed ◽  
Submerged Arc Welding ◽  
Average Value ◽  
Steel Tank ◽  
Welding Line ◽  
Set Up ◽  
Submerged Arc ◽  
Tandem Submerged Arc Welding

The objective of this research is to investigate the appropriated Tandem Submerged Arc Welding (TSAW) by Punch through technique for high pressure steel tank in ship building industry. Electrode Type AWS A5.17 EM12K and powder flux type AWS A5.17 F7A6 have been applied with electric current at AC+ 550-700 Amp/DC 460-610 Amp. The welding travel speed is controlled between 515-590 mm/min with arc length between 25-30 mm which SM400 steel type is 25 mm thickness. The welding is in horizontal position without any bevel on the steel piece. Studying the suitable parameters from the experiment type 24 of this procedure experiment, the result has been found that the most suitable parameter set up for this welding is DC460, AC550, ST515, AL25. The experiment follows AWS D1.1 standard with 100% full penetration, tensile value at 542.61 N/mm2. Welding line supports impact test at 0°C with average value of 66 Joules, average hardness value at 156.4 HV, bending at 180°. With out any defected found. Moreover, this method can be reduced welding cost around18,482 baht/day and also increased the welding lenght around 168%.

Crack Analysis of Induction Heating Bent Pipe

2010 ◽  
Vol 29-32 ◽  
pp. 697-702
Author(s):  
Zhuan Zhao Yang ◽  
Dao Xin Liu ◽  
Xiao Hua Zhang
Keyword(s):  
High Temperature ◽  
Base Metal ◽  
Arc Welding ◽  
Initial Point ◽  
Longitudinal Direction ◽  
Submerged Arc Welding ◽  
Pipe Production ◽  
Bent Pipe ◽  
And Diffusion ◽  
Submerged Arc

There were 20 of 103 length of pipe found cracks on the extrados surface of the bent pipe made of Φ406.4×10mm L360 Longitudinal Submerged Arc Welding (LSAW) pipe, the cracks were mostly distributed in the extrados surface and the arc initial point of the bent pipe, the cracks were spindle-shaped and narrow at both ends with the longitudinal direction vertical to the axis of bent pipe. The mechanism and the causes of the cracks were studied by macro inspection, mechanical property test, microscope, scanning electron microscopy and energy spectrum analysis, which shown that the cracks were result from the contamination of copper or its alloy during or before the bent pipe production. The contaminated material like copper infiltrated and diffused into the base metal at high temperature, and could hardly stead to and transfer the normal stress from the base metal where the inertial crack was shaped. Meanwhile, the new crack was formed at the tip of inertial crack after the new infiltration and diffusion under the condition of both high temperature and tensile stress, so that the crack progressed and extended in this way.

Performance Evaluation of Alternating Current Square Waveform Submerged Arc Welding as a Candidate for Fabrication of Thick Welds in 2.25Cr-1Mo Heat-Resistant Steel

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Uttam Kumar Mohanty ◽  
Yohei Abe ◽  
Takahiro Fujimoto ◽  
Mitsuyoshi Nakatani ◽  
Akikazu Kitagawa ◽  
...  
Keyword(s):  
High Pressure ◽  
Arc Welding ◽  
Submerged Arc Welding ◽  
Pressure Vessels ◽  
Heat Consumption ◽  
Welding Parameters ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Flux Consumption ◽  
Submerged Arc

Abstract The paper evaluates the performance of alternating current (AC) square waveform submerged arc welding (SAW) as a candidate technology for manufacturing thick welds for high-pressure vessels. A new mathematical formulation for calculating melting efficiency in square waveform arc welding is presented. The melting efficiency and the heat consumption are presented as a mathematical model of welding parameters, namely welding current, welding speed, current frequency, and electrode negativity (EN) ratio. The proposed approach is demonstrated through the welding of 2.25Cr-1Mo heat-resistant steel performed over a wide range of welding parameters. The investigation provides deeper insights into the interplay between process parameter, total heat consumption, and melting efficiency. The effect on flux consumption is also explained. The melting efficiency is inversely proportional to flux consumption. The welding heat does not necessarily promote the plate melting. Improper use of welding heat may lead to decreased melting efficiency and increased unwanted melting and consumption of welding flux. Compared to the conventional direct current (DC) power sources, the AC square waveform welding achieves almost the same order of melting efficiency with added advantages of better weld bead shape and flux consumption in a desirable range. The two additional parameters (frequency and EN ratio) of the AC square waveform power source provide more freedom to fine-tune the process and thereby efficiently use welding heat. The results of this investigation will be advantageous to the designers and fabricators of high-pressure vessels using AC square waveform welding.

Revisiting the High-Pressure Properties of the Metal-Organic Frameworks ZIF-8 and ZIF-67

2020 ◽  
Author(s):  
Pia Vervoorts ◽  
Stefan Burger ◽  
Karina Hemmer ◽  
Gregor Kieslich
Keyword(s):  
High Pressure ◽  
State Of The Art ◽  
Energy Landscape ◽  
Structural Flexibility ◽  
Zeolitic Imidazolate Frameworks ◽  
Stimuli Responsive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Open Questions ◽  
Metal Organic

The zeolitic imidazolate frameworks ZIF-8 and ZIF-67 harbour a series of fascinating stimuli responsive properties. Looking at their responsitivity to hydrostatic pressure as stimulus, open questions exist regarding the isotropic compression with non-penetrating pressure transmitting media. By applying a state-of-the-art high-pressure powder X-ray diffraction setup, we revisit the high-pressure behaviour of ZIF-8 and ZIF-67 up to <i>p</i> = 0.4 GPa in small pressure increments. We observe a drastic, reversible change of high-pressure powder X-ray diffraction data at <i>p</i> = 0.3 GPa, discovering large volume structural flexibility in ZIF-8 and ZIF-67. Our results imply a shallow underlying energy landscape in ZIF-8 and ZIF-67, an observation that might point at rich polymorphism of ZIF-8 and ZIF-67, similar to ZIF-4(Zn).<br>

Revisiting the High-Pressure Properties of the Metal-Organic Frameworks ZIF-8 and ZIF-67

2020 ◽  
Author(s):  
Pia Vervoorts ◽  
Stefan Burger ◽  
Karina Hemmer ◽  
Gregor Kieslich
Keyword(s):  
High Pressure ◽  
State Of The Art ◽  
Energy Landscape ◽  
Structural Flexibility ◽  
Zeolitic Imidazolate Frameworks ◽  
Stimuli Responsive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Open Questions ◽  
Metal Organic

The zeolitic imidazolate frameworks ZIF-8 and ZIF-67 harbour a series of fascinating stimuli responsive properties. Looking at their responsitivity to hydrostatic pressure as stimulus, open questions exist regarding the isotropic compression with non-penetrating pressure transmitting media. By applying a state-of-the-art high-pressure powder X-ray diffraction setup, we revisit the high-pressure behaviour of ZIF-8 and ZIF-67 up to <i>p</i> = 0.4 GPa in small pressure increments. We observe a drastic, reversible change of high-pressure powder X-ray diffraction data at <i>p</i> = 0.3 GPa, discovering large volume structural flexibility in ZIF-8 and ZIF-67. Our results imply a shallow underlying energy landscape in ZIF-8 and ZIF-67, an observation that might point at rich polymorphism of ZIF-8 and ZIF-67, similar to ZIF-4(Zn).<br>

New submerged arc welding flux for hardfacing of Hardox steels

2020 ◽  
Vol 62 (10) ◽  
pp. 1010-1016
Author(s):  
Mustafa Kaptanoglu ◽  
Akin Odabasi
Keyword(s):  
Arc Welding ◽  
Submerged Arc Welding ◽  
Welding Flux ◽  
Submerged Arc

METRODE 20.70 Nb

Alloy Digest ◽  
2003 ◽  
Vol 52 (4) ◽  
Keyword(s):  
Fracture Toughness ◽  
Tensile Properties ◽  
Arc Welding ◽  
Nickel Alloys ◽  
Submerged Arc Welding ◽  
Inert Gas ◽  
Nominal Composition ◽  
Oxidation Resistant ◽  
Nickel Base ◽  
Submerged Arc

Abstract Metrode 20.70 Nb is a nickel-base consumable with a nominal composition of Ni, 20% Cr, and 2.5% Nb. This alloy is used to join a variety of oxidation-resistant nickel alloys. The product is a solid wire for tungsten inert gas (TIG), metal inert gas (MIG), and submerged arc welding (SAW). This datasheet provides information on tensile properties as well as fracture toughness. It also includes information on joining. Filing Code: Ni-606. Producer or source: Metrode Products Ltd.

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