scholarly journals Metallurgical Effect of Rare-Earth Lanthanum Fluoride and Boride in the Composite Coating of Wires in the Arc Welding of Bainitic-Martensitic and Austenitic Steel

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1334
Author(s):  
Sergey G. Parshin
Keyword(s):  
Rare Earth ◽  
Composite Coating ◽  
Arc Welding ◽  
Martensitic Steel ◽  
Steel Wire ◽  
High Strength ◽  
Lanthanum Fluoride ◽  
Microstructural Refinement ◽  
Refractory Compounds ◽  
The Impact

For arc welding of high-strength and cold-resistant steels, the author developed an advanced design of steel wire with a micro-composite coating of a nickel matrix and nanoparticles of LaF3 and LaB6, which improves the metallurgical influence of rare-earth elements (REE) and forms refractory sulphides and oxides of REE, as well as boron nitride. The addition of 0.1–0.3 wt% La in the weld pool leads to an increase in the content of the refractory compounds La2O3, LaO2, and LaS, and to the reduction in the content of the low-melting and brittle oxides and sulphides SiO2, SiO, MnO, MnS, and SiS. The use of steel wire with the composite coating of LaF3 and LaB6 allows for microstructural refinement when welding S960QL bainitic-martensitic steel and X70 API bainitic steel, and increases the impact toughness of the welds by 1.17–1.6 times.

scholarly journals Pulse spray gas metal arc welding of advanced high strength S650MC automotive steel

10.30544/682 ◽  
2021 ◽  
Vol 27 (4) ◽  
pp. 505-517
Author(s):  
Ashok Kumar Srivastava ◽  
Pradip K Patra
Keyword(s):  
Weld Joint ◽  
Heat Input ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
High Strength Steels ◽  
High Strength ◽  
Filler Wire ◽  
Advanced High Strength Steels ◽  
Metal Arc Welding ◽  
The Impact

With an increasing demand for safer and greener vehicles, mild steel and high strength steel are being replaced by much stronger advanced high strength steels of thinner gauges. However, the welding process of advanced high strength steels is not developed at the same pace. The performance of these welded automotive structural components depends largely on the external and internal quality of weldment. Gas metal arc welding (GMAW) is one of the most common methods used in the automotive industry to join car body parts of dissimilar high strength steels. It is also recognized for its versatility and speed. In this work, after a review of GMAW process and issues in welding of advanced high strength steels, a welding experiment is carried out with varying heat input by using spray and pulse-spray transfer GMAW method with filler wires of three different strength levels. The experiment results, including macro-microstructure, mechanical properties, and microhardness of weld samples, are investigated in detail. Very good weldability of S650MC is demonstrated through the weld joint efficiency > 90%; no crack in bending of weld joints, or fracture of tensile test sample within weld joint or heat affected zone (HAZ), or softening of the HAZ. Pulse spray is superior because of thinner HAZ width and finer microstructure on account of lower heat input. The impact of filler wire strength on weldability is insignificant. However, high strength filler wire (ER100SG) may be chosen as per standard welding practice of matching strength.

Study of GMAW Process Parameters on the Mechanisms of Wear in Contact Tips C12200 Alloy

2015 ◽  
Vol 1766 ◽  
pp. 53-62 ◽  
Author(s):  
Luis A. López ◽  
Gladys Y. Perez ◽  
Felipe J. Garcia ◽  
Víctor H. López
Keyword(s):  
Process Parameters ◽  
Arc Welding ◽  
Hsla Steel ◽  
Gas Metal Arc Welding ◽  
High Strength ◽  
Maximum Temperature ◽  
Metal Arc Welding ◽  
C 30 ◽  
The Impact ◽  
Manual Mode

ABSTRACTThis paper focuses on the impact of process parameters of gas metal arc welding (GMAW) on the mechanisms of fail and wear present in the contact tips (CT), component located in the welding gun, when high strength low alloy (HSLA) steel is welded with ER70S - 0.045” copper coated electrode in manual mode. By means of chemical analysis the alloy was identified as C12200. It was also identified that the maximum temperature reached by the CT is 850° C. 30 samples were obtained that had different lifetime, which were analyzed by stereoscope and its behavior against wear was determined by using an equation of relative wear. Microstructural changes as recrystallization and grain growth undergone by these CT were also evidenced by light microscopy. In addition the changes in their mechanical properties such as decrease in their hardness to about of half that initially had. Finally some significant samples were analyzed by scanning electron microscopy (SEM); microanalysis was used to identify the exchange of matter leaving from the electrode in the CT and spatter into the hole of the component.

Study on Property and Microstructure in HAZ of High-Strength Abrasion-Resistant Steel

2006 ◽  
Vol 306-308 ◽  
pp. 947-952
Author(s):  
Ji Tai Niu ◽  
Wei Feng Huang ◽  
Jing Jun Xu ◽  
Yong Liang Guo
Keyword(s):  
Impact Toughness ◽  
Arc Welding ◽  
Physical Simulation ◽  
Heating Temperature ◽  
High Strength ◽  
Welding Parameters ◽  
Gas Shielded Arc Welding ◽  
Resistant Steel ◽  
Carbon Dioxide Gas ◽  
The Impact

In this paper, a type of the high-strength abrasion-resistant steel-NM360 has been studied with the aid of the modern physical simulation technology to solve the problem of its poor weldability. In the experiment, the welding thermal cycles under different cooling conditions with the peak heating temperature of 1320oC were simulated via the Gleeble-1500D thermal/mechanical simulator. The SH-CCT diagram of NM360 has been established by investigating the microstructure transformation course and the hardness of the welded heat-affected zone (HAZ) near fusion line during different cooling process. Moreover, the impact toughness and fracture in HAZ with different cooling rate have been studied. The established SH-CCT diagram and impact toughness in HAZ provide the referential experimental basis for selecting proper welding parameters. At last, the welding parameters for NM360 steel are determined with the aid of nomography of carbon dioxide gas shielded arc welding and empirical formula.

scholarly journals Weldability and Lamellar Tearing Susceptibility of High-Strength SN 490C Steel Plates

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 551 ◽  
Author(s):  
Donghyun Van ◽  
Seung Hwan Lee ◽  
Kihyuk Kim ◽  
Hoseop Sim
Keyword(s):  
Arc Welding ◽  
High Strength ◽  
Steel Plates ◽  
Hardness Profile ◽  
Building Structures ◽  
Heat Effects ◽  
Flux Cored Arc Welding ◽  
Lamellar Tearing ◽  
The Impact ◽  
Submerged Arc

In this study, weldability and cracking susceptibility of SN 490C steel were firstly investigated. For this study, SN 490C thick plates which had been developed for anti-seismic steel of building structures were welded by flux-cored arc welding (FCAW) and submerged arc welding (SAW) processes based on welding conditions of actual construction site. Weldments using the plates with different thickness were produced using E71T-1C and EH14 filler wires, respectively. For the weldability tests, various welded joints such as butt and T-joints were examined. After welding, microstructure analysis was performed. Various microstructures were found depending on the location of the weldments. Heat effects by multi-pass welding were correlated with the microstructure. The microstructure was correlated with the hardness profile and the impact test result. In addition, the through-thickness tensile test, window test, and Cranfield test were conducted to evaluate sensitivity of lamellar tearing, which may occur during tensile restraint stress of welds. As a result of the tests, it was found that the SN 490C steel was sufficiently resistant to lamellar tearing.

Microstructural refinement in an ultra-high strength martensitic steel via equal channel angular pressing

2018 ◽  
Vol 725 ◽  
pp. 57-64 ◽  
Author(s):  
S.L. Gibbons ◽  
R.A. Abrahams ◽  
M.W. Vaughan ◽  
R.E. Barber ◽  
R.C. Harris ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Martensitic Steel ◽  
High Strength ◽  
Microstructural Refinement ◽  
Angular Pressing

Effect of Microstructure of Welded Joints HG785D on Impact Toughness

2016 ◽  
Vol 693 ◽  
pp. 740-746
Author(s):  
Qiang Zhang ◽  
Jian Min Han ◽  
Zhi Yong Yang ◽  
Jun Qiang Wang
Keyword(s):  
Impact Toughness ◽  
Arc Welding ◽  
Weld Seam ◽  
High Strength ◽  
Gas Shielded Arc Welding ◽  
High Angle ◽  
Fine Grain ◽  
Large Size ◽  
Effective Grain Size ◽  
The Impact

The microstructure and impact toughness of joints of HG785D high strength steel welded by metal active gas shielded arc welding (80%Ar+20%CO2) was observed and analyzed. The result showed that the microstructure of weld seam was mainly composed of acicular ferrite, the impact energy of which was better. While the microstructure of HAZ with large size bainite and M-A island. Using the method of EBSD, it's also found that the effective grain size of weld seam was similar with fine grain HAZ. However the proportion of high-angle grain boundary in weld seam was much larger than that of HAZ. As a result, it could arrest propagating cracks and enhance the toughness.

ELEKTRON EQ2

Alloy Digest ◽  
2015 ◽  
Vol 64 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Rare Earth ◽  
High Temperature ◽  
Magnesium Alloy ◽  
North America ◽  
Earth Element ◽  
High Strength ◽  
Heat Treating ◽  
Bend Strength ◽  
Temperature Performance

Abstract Elektron EQ21 is a casting high strength magnesium alloy developed as a heat treatable alloy with rare earth element additions. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive, shear, and bend strength as well as creep. It also includes information on high temperature performance and corrosion resistance as well as casting, forming, heat treating, machining, joining, and surface treatment. Filing Code: Mg-80. Producer or source: Magnesium Elektron Wrought Products, North America.

TRI-MARK TM-115

Alloy Digest ◽  
1983 ◽  
Vol 32 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Arc Welding ◽  
High Strength ◽  
Heat Treating ◽  
Low Alloy Steels ◽  
Mining Equipment ◽  
Alloy Steels ◽  
Temperature Impact ◽  
Welding Electrode

Abstract TRI-MARK TM-115 is a gas-shielded flux-cored welding electrode for continuous high deposition are welding. It is designed specifically for semiautomatic and automatic arc welding of high-strength low-alloy steels and quenched-and-tempered steels. This gas-sheilded tubular wire can be used for single and multiple-pass welding. It has outstanding low-temperature impact properties. Its applications including mining equipment, large vehicles and similar items. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as heat treating, machining, and joining. Filing Code: SA-392. Producer or source: Tri-Mark Inc..

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