selected properties OF hybrid PTA-MAG welded joints of thermomechanically rolled s700MC steel

Skowrońska, Beata; Chmielewski, Tomasz; Sałaciński, Tadeusz; Szulc, J.; Świercz, Rafał

doi:10.37904/metal.2020.3506

Cited by 7 publications

(7 citation statements)

References 6 publications

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“…High-Strength-Low-Alloy (HSLA) steel is commonly used in building construction, offshore construction, and automotive industries [ 26 , 27 , 28 ]. Using HSLA steel will excessively reduce the welding costs [ 29 , 30 , 31 , 32 ]. Part of the structure that works under water may need repair work.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Damage Detection on Typical Joints of Jackets Platform Based on Electro-Mechanical Impedance Technique

et al. 2021

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Many methods have been used in the past two decades to detect crack damage in steel joints of the offshore structures, but the electromechanical impedance (EMI) method is a comparatively recent non-destructive method that can be used for quality monitoring of the weld in structural steel joints. The EMI method ensures the direct assessment, analysis and particularly the recognition of structural dynamics by acquiring its EM admittance signatures. This research paper first briefly introduces the theoretical background of the EMI method, followed by carrying out the experimental work in which damage in the form of a crack is simulated by using an impedance analyser at different distances. The EMI technique is used to identify the existence of damage in the welded steel joints of offshore steel jacket structures, and Q345B steel was chosen as the material for test in the present study. Sub-millimetre cracks were found in four typical welded steel joints on the jacket platform under circulating loads, and root average variance was used to assess the extent of the crack damage.

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Section: Introductionmentioning

confidence: 99%

An Experimental Study of Damage Detection on Typical Joints of Jackets Platform Based on Electro-Mechanical Impedance Technique

et al. 2021

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“…However, it should be noted that the welding of steels provided with zinc coatings necessitates leaving a narrow gap (between 0.1 mm and 0.2 mm) between elements to be joined (to prevent the formation of porosity). Interestingly, it is also possible to weld such sheets without leaving the gap, yet in such a case, the joining process requires the application of two laser beams, where the first beam heats up the zinc layer (causing the evaporation of the latter), whereas the second beam is used to weld the elements [ 41 , 42 , 43 , 44 , 45 ].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Laser Beam Welding of Galvanized Car Body Steel with an Additional Organic Protective Layer

et al. 2023

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This study discusses the effect of laser beam welding parameters on the structure, mechanical properties and corrosion resistance of 1.2 mm thick galvanized sheets made of low-carbon steel DC04 provided with a ZE36/36 GardoprotectOC2BU organic coating. The test laser beam butt welded joints were made without the filler metal, using a variable welding rate, where linear welding energy was restricted within the range of 30 J/mm to 90 J/mm. The joints were subjected to non-destructive tests, destructive tests and corrosion resistance tests. The tests revealed the possibility of making joints meeting the criteria specified in the ISO 15614-11 standard. Regardless of the value of linear welding energy applied in the process, all the joints were characterised by high mechanical and plastic properties. It was noticed that an increase in linear welding energy from 30 J/mm to 90 J/mm was accompanied by the widening of the weld and that of the heat-affected zone (HAZ). In addition, an increase in linear welding energy was accompanied by a decrease in the maximum weld hardness to approximately 250 HV0.2. In the HAZ, hardness was restricted within the range of 190 HV0.2 to 230 HV0.2 and decreased along with increasing linear welding energy. In the static tensile test, regardless of the value of linear welding energy, the test specimen ruptured in the base material. In the bend test, regardless of the value of linear welding energy, a bend angle of 180° was obtained without partial tear or scratches; unit elongation was restricted within the range of 29% to 42%. The electrochemical tests and experiments performed in the salt spray chamber revealed the very high effectiveness of the corrosion protections against aggressive chloride ions.

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“…Therefore, welding of such materials without losing their high properties, especially in the heat-affected zone, is much more difficult. For joining thermomechanically processed steels with a thickness of 10 mm, the use of hybrid welding methods, i.e., laser + metal active gas (MAG) [ 23 ] or plasma + MAG [ 24 , 25 ], reduced the amount of heat supplied to the material and limited the range of recrystallization. Also, the weld formed by melting and primer crystallization of the parent material during laser welding was characterized by lower mechanical properties (i.e., hardness and impact toughness) than, for example, a MAG weld (in which, together with the additional material, elements increasing the mechanical properties of the weld are supplied) [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Investigation of a Friction-Welded 316L Stainless Steel with Ultrafine-Grained Structure Obtained by Hydrostatic Extrusion

et al. 2021

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The paper presents the microstructural investigation of a friction-welded joint made of 316L stainless steel with an ultrafine-grained structure obtained by hydrostatic extrusion (HE). Such a plastically deformed material is characterized by a metastable state of energy equilibrium, increasing, among others, its sensitivity to high temperatures. This feature makes it difficult to weld ultra-fine-grained metals without losing their high mechanical properties. The use of high-speed friction welding and a friction time of <1 s reduced the scale of the weakening of the friction joint in relation to result obtained in conventional rotary friction welding. The study of changes in the microstructure of individual zones of the friction joint was carried out on an optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and electron backscattered diffraction (EBSD) analysis system. The correlation between the microstructure and hardness of the friction joint is also presented. The heat released during the high-speed friction welding initiated the process of dynamic recrystallization (DRX) of single grains in the heat-affected zone (HAZ). The additional occurrence of strong plastic deformations (in HAZ) during flash formation and internal friction (in the friction weld and high-temperature HAZ) contributed to the formation of a highly deformed microstructure with numerous sub-grains. The zones with a microstructure other than the base material were characterized by lower hardness. Due to the complexity of the microstructure and its multifactorial impact on the properties of the friction-welded joint, strength should be the criterion for assessing the properties of the joint.

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selected properties OF hybrid PTA-MAG welded joints of thermomechanically rolled s700MC steel

Cited by 7 publications

References 6 publications

An Experimental Study of Damage Detection on Typical Joints of Jackets Platform Based on Electro-Mechanical Impedance Technique

An Experimental Study of Damage Detection on Typical Joints of Jackets Platform Based on Electro-Mechanical Impedance Technique

Assessment of the Laser Beam Welding of Galvanized Car Body Steel with an Additional Organic Protective Layer

Microstructural Investigation of a Friction-Welded 316L Stainless Steel with Ultrafine-Grained Structure Obtained by Hydrostatic Extrusion

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