scholarly journals Cold Cracking Of Underwater Wet Welded S355G10+N High Strength Steel

2015 ◽  
Vol 15 (3) ◽  
pp. 48-56 ◽  
Author(s):  
D. Fydrych ◽  
J. Łabanowski ◽  
J. Tomków ◽  
G. Rogalski
Keyword(s):  
High Strength Steel ◽  
Welding Process ◽  
High Strength ◽  
Cold Cracking ◽  
Test Results ◽  
Ocean Engineering ◽  
Diffusible Hydrogen ◽  
Underwater Welding ◽  
Weld Area ◽  
Steel Joints

Abstract Water as the welding environment determines some essential problems influencing steel weldability. Underwater welding of high strength steel joints causes increase susceptibility to cold cracking, which is an effect of much faster heat transfer from the weld area and presence of diffusible hydrogen causing increased metal fragility. The paper evaluates the susceptibility to cold cracking of the high strength S355G10+N steel used, among others, for ocean engineering and hydrotechnical structures, which require underwater welding. It has been found from the CTS test results that the investigated steel is susceptible to cold cracking in the wet welding process.

Hydrogen Charging of High Strength Steel Specimens and Physical Simulation of Cold Cracking under Laser Beam Welding Conditions

2012 ◽  
Vol 706-709 ◽  
pp. 1391-1396
Author(s):  
Ossama Dreibati ◽  
R. Ossenbrink ◽  
Vesselin Michailov
Keyword(s):  
Laser Beam ◽  
High Strength Steel ◽  
Physical Simulation ◽  
Laser Beam Welding ◽  
High Strength ◽  
Cold Cracking ◽  
Tension Stress ◽  
Pure Hydrogen ◽  
Diffusible Hydrogen ◽  
Hydrogen Charging

Cold cracks occur during the cooling down of welded joint at low temperatures or later at room temperature after the end of welding. It is associated with the formation of brittle microstructures as martensite in the presence of diffusible hydrogen as well as of tension stresses. By using an enhanced Simulation-und Testing Center Gleeble 3500, a procedure for physical simulation of cold cracking under laser beam welding conditions is suggested. The approach reproduces combinations of the cold crack main parameters, a brittle microstructure, tension stress and high local hydrogen concentration under welding conditions which induce a cold crack. A specimen geometry and technique were developed to enable the gaseous hydrogen charging from pure hydrogen atmosphere. The amount of charged hydrogen can be adjusted through varying the charging parameters like temperature, gas pressure and charging time. The hydrogen charging technique and the cold crack testing procedure were proven with high strength steel specimens.

scholarly journals Prediction of the Shear Tension Strength of Resistance Spot Welded Thin Steel Sheets from High- to Ultrahigh Strength Range

2021 ◽  
Author(s):  
Kornél Májlinger ◽  
Levente T. Katula ◽  
Balázs Varbai
Keyword(s):  
High Strength Steel ◽  
Welding Process ◽  
High Strength ◽  
Professional Literature ◽  
Resistance Spot ◽  
Base Materials ◽  
Ultra High Strength Steel ◽  
Steel Grades ◽  
Steel Joints ◽  
Tension Strength

The tensile strength of newly developed ultra-high strength steel grades is now above 1800 MPa, and even new steel grades are currently in development. One typical welding process to join thin steels sheets is resistance spot welding (RSW). Some standardized and not standardized formulas predict the minimal shear tension strength (STS) of RSWed joints, but those formulas are less and less accurate with the higher base materials strength. Therefore, in our current research, we investigated a significant amount of STS data of the professional literature and our own experiments and recommended a new formula to predict the STS of RSWed high strength steel joints. The proposed correlation gives a better prediction than the other formulas, not only in the ultra-high strength steel range but also in the lower steel strength domain.

scholarly journals Effect of Electrode Waterproof Coating on Quality of Underwater Wet Welded Joints

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2947 ◽  
Author(s):  
Jacek Tomków ◽  
Dariusz Fydrych ◽  
Kamil Wilk
Keyword(s):  
Hydrogen Content ◽  
Welded Joints ◽  
High Strength ◽  
Industrial Applications ◽  
Cold Cracking ◽  
Diffusible Hydrogen ◽  
Deposited Metal ◽  
Covered Electrodes ◽  
Steel Joints

In this paper, the effects of different hydrophobic coatings on the surface of covered electrodes on the quality of wet welded carbon steel joints were discussed. Commonly available hydrophobic substances used in industrial applications were selected for the research. The aim of using waterproof coatings was to check the possibility to decreasing the susceptibility of high-strength low-alloy S460N steel to cold cracking. During experiments diffusible hydrogen content in deposited metal determination by mercury method, metallographic macro- and microscopic testing and hardness measurements were performed. Investigations showed that waterproof coatings laid on covered electrodes can improve the quality of wet welded joints, by decreasing the Vickers HV10 hardness in heat-affected zone and decreasing the diffusible hydrogen content in deposited metal, which minimalize possibility of cold cracking.

scholarly journals Weldability of high strength steels in wet welding conditions

2013 ◽  
Vol 20 (2) ◽  
pp. 67-73 ◽  
Author(s):  
Dariusz Fydrych ◽  
Jerzy Łabanowski ◽  
Grzegorz Rogalski
Keyword(s):  
High Strength Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Cold Cracking ◽  
High Susceptibility ◽  
Welded Steel ◽  
Underwater Wet Welding ◽  
Formation Of Cracks ◽  
Steel Joints ◽  
Welding Technique

Abstract In this paper are characterized problems of high strength steel weldability in underwater wet welding conditions. Water as a welding environment intensifies action of unfavourable factors which influence susceptibility to cold cracking of welded steel joints. The susceptibility to cold cracking of S355J2G3 steel and S500M steel in wet conditions was experimentally estimated (by using Tekken test). It was concluded that the steels in question are characterized by a high susceptibility to formation of cracks in welds. Usefulness of the proposed Temper Bead Welding technique (TBW) was experimentally verified as a method for improving weldability of the steels in the analyzed conditions.

scholarly journals Experimental Investigation into Corrosion Effect on Mechanical Properties of High Strength Steel Bars under Dynamic Loadings

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Hui Chen ◽  
Jinjin Zhang ◽  
Jin Yang ◽  
Feilong Ye
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Dynamic Loading ◽  
High Strength Steel ◽  
High Strength ◽  
Tensile Tests ◽  
Reinforcing Steel ◽  
Test Results ◽  
Cross Sectional ◽  
Steel Bars

The tensile behaviors of corroded steel bars are important in the capacity evaluation of corroded reinforced concrete structures. The present paper studies the mechanical behavior of the corroded high strength reinforcing steel bars under static and dynamic loading. High strength reinforcing steel bars were corroded by using accelerated corrosion methods and the tensile tests were carried out under different strain rates. The results showed that the mechanical properties of corroded high strength steel bars were strain rate dependent, and the strain rate effect decreased with the increase of corrosion degree. The decreased nominal yield and ultimate strengths were mainly caused by the reduction of cross-sectional areas, and the decreased ultimate deformation and the shortened yield plateau resulted from the intensified stress concentration at the nonuniform reduction. Based on the test results, reduction factors were proposed to relate the tensile behaviors with the corrosion degree and strain rate for corroded bars. A modified Johnson-Cook strength model of corroded high strength steel bars under dynamic loading was proposed by taking into account the influence of corrosion degree. Comparison between the model and test results showed that proposed model properly describes the dynamic response of the corroded high strength rebars.

Microstructures and mechanical properties of flash butt welded high strength steel joints

2016 ◽  
Vol 96 ◽  
pp. 506-514 ◽  
Author(s):  
Chenyao Xi ◽  
Daqian Sun ◽  
Zhaozhi Xuan ◽  
Jiegong Wang ◽  
Guoshan Song
Keyword(s):  
Mechanical Properties ◽  
High Strength Steel ◽  
High Strength ◽  
Microstructures And Mechanical Properties ◽  
Steel Joints
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