scholarly journals Research on Parameters of Wire-Filling Laser Welding and Quenching Process for Joints Microstructure and Mechanical Property of BR1500HS Steel

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1047
Author(s):  
Lianpu Zhou ◽  
Chundong Zhu ◽  
Rongfei Ma ◽  
Zihao Wei
Keyword(s):  
Laser Welding ◽  
Heat Input ◽  
Retained Austenite ◽  
Fracture Morphology ◽  
Boron Steel ◽  
Test Machine ◽  
Quenching Process ◽  
Feeding Speed ◽  
Wire Feeding ◽  
Grain Diameter

With the aim to investigate the effect of parameters and the quenching process on the joint microstructure and mechanical properties of hot stamping steel by laser welding, BR1500HS boron steel was welded by wire-filling laser welding with ER70-G welding wire under different parameters. The welded specimens were heated to 900 °C and held for 5 min before water quenching. A universal material test machine, optical microscope, Vickers hardness tester, scanning electron microscope, and electron backscatter diffraction (EBSD) were used to characterize. The results show that the heat input should be greater than 1040 J/cm and the optimal wire-feeding speed is between 160 cm/min and 180 cm/min. The tensile strength of the quenched joint can reach greater than 1601.9 MPa at compatible parameters. More retained austenite distributes in the fusion zone (FZ) and fine grain zone (FGZ) than the coarse grain zone (CGZ) before quenching. However, the retained austenite in FZ and heat-affected zone (HAZ) decreases clearly and distributes uniformly after quenching. The grain diameter in FZ before quenching is not uniform and there are some coarse grains with the diameter greater than 40 μm. After quenching, the grains are refined and grain diameter is more uniform in the joint. With the increase in heat input, the microhardness of FZ and HAZ before quenching decreases from 500 HV to 450 HV. However, if the wire-feeding speed increases, the microhardness of FZ and HAZ before quenching increases from 450 HV to 500 HV. After quenching, the joint microhardness of all samples is between 450 HV and 550 HV. The fracture morphology of the joint before quenching consists of a large number of dimples and little river patterns. After quenching, the fracture morphology consists of a large amount of river patterns and cleavage facets due to the generation of martensite.

scholarly journals Research on Parameters of Wire-Filling Laser Welding and Quenching Process for Joints Microstructure and Mechanical Property of BR1500HS Steel

2021 ◽  
Author(s):  
Lianpu Zhou ◽  
Chundong Zhu ◽  
Rongfei Ma ◽  
Zihao Wei
Keyword(s):  
Laser Welding ◽  
Heat Input ◽  
Boron Steel ◽  
Feed Speed ◽  
Curve Shape ◽  
Quenching Process ◽  
Hyperbolic Curve ◽  
Wire Feed Speed ◽  
Wire Feed ◽  
Grain Diameter

With the aim to investigate the effect of parameter and quenching process on the joint of hot stamping steel by laser welding, the BR1500HS boron steel was welded by filling-wire laser welding with ER70-G welding wire under different parameters. The welded specimens were heated to 900℃ and held for 5min before water quenching. The universal material test machine, Optical micro-scope, Vickers hardness tester, scanning electron microscope and electron backscatter diffraction (EBSD) were used to characterize. The results showed that the macroscopic morphology of fusion zone (FZ) becomes from funnelform to hyperbolic curve shape when heat input increases and from hyperbolic curve shape to funnelform when wire-feed speed increases. The strength after quenching is more than 1557Mpa at heat input of 1040J/cm, wire feeding speed of 1.6m/min~1.8m/min and welding speed of 1.5m/min. EBSD test showed that the FZ and fine grain zone (FGZ) have more retained austenite (RA) than coarse grain zone (CGZ) before quenching and RA in FZ and heat affect zone (HAZ) decreased and distributed uniformed after quenching. The grain diameter in FZ distribute unevenly, with the maximum grain diameter larger than 40μm before quenching. After quenching, the grain diameter of FZ, HAZ and BM is more even and coarse grains in the FZ was refined. Before quenching, the microhardness of FZ and HAZ is of 450HV~500HV at different heat input and wire-feed speed and all region of joint keeps at 450HV~550HV after quenching. Most dimple and little river pattern in the joint fracture mor-phology before quenching indicates a well plasticity and most cleavage facet is observed after quenching due to the joint combine with martensite.

scholarly journals Effect of Heat Input on Microstructure and Hardness Distribution of Laser Welded Si-Al TRIP-Type Steel

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Adam Grajcar ◽  
Maciej Różański ◽  
Sebastian Stano ◽  
Aleksander Kowalski ◽  
Barbara Grzegorczyk
Keyword(s):  
Laser Welding ◽  
Heat Input ◽  
Retained Austenite ◽  
Microstructural Analysis ◽  
Solid State Laser ◽  
Rolled Sheet ◽  
Hardness Distribution ◽  
Trip Steels ◽  
Cooling Conditions ◽  
Maximum Value

This study is concerned with issues related to laser welding of Si-Al type TRIP steels with Nb and Ti microadditions. The tests of laser welding of thermomechanically rolled sheet sections were carried out using keyhole welding and a solid-state laser. The tests carried out for various values of heat input were followed by macro- and microscopic metallographic investigations as well as by microhardness measurements of welded areas. A detailed microstructural analysis was carried out in the penetration area and in various areas of the heat affected zone (HAZ). Special attention was paid to the influence of cooling conditions on the stabilisation of retained austenite, the most characteristic structural component of TRIP steels. The tests made it possible to determine the maximum value of heat input preventing the excessive grain growth in HAZ and to identify the areas of the greatest hardness reaching 520 HV0.1.

scholarly journals Process Optimization on Multilayer Morphology During 316L Double-wire CMT+P Deposition Process

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1334
Author(s):  
Wei Wu ◽  
Jiaxiang Xue ◽  
Zhanhui Zhang ◽  
Xianghui Ren ◽  
Bin Xie
Keyword(s):  
Stainless Steel ◽  
Heat Input ◽  
High Efficiency ◽  
Speed Ratio ◽  
Optimum Process ◽  
Heat Accumulation ◽  
Forming Process ◽  
Cold Metal Transfer ◽  
Feeding Speed ◽  
Wire Feeding

Cold metal transfer (CMT) has been widely used in metal additive manufacturing for its low heat input, less splashing and high efficiency. Wire feeding speed and travelling speed are important processes that affect morphology in CMT deposition. This study optimized the forming process of 30-layer stainless-steel part deposited by double-wire and double-arc CMT plus pulse (CMT+P) process, and investigated the effect of the ratio of wire feeding speed to travelling speed on deposition morphology. The results show that asynchronous arc striking and extinguishing can improve the forming. Moreover, the deposition molding is affected by the interaction of heat input and heat accumulation. With the similar ratio of wire feeding speed to travelling speed and the similar heat input, increasing the wire feeding speed can increase the heat accumulation and the width of sample, and decrease the height. The optimum process interval of wire feeding speed to travelling speed ratio and heat input is 3.9–4.2 and 70–74.8 J/mm, respectively. Although the increasing heat accumulation makes grain coarse and slight decreases mechanical property, the highest deposition rate can be up to 5.4 kg/h, when wire feeding speed and travelling speed are 5 m/min and 120 cm/min, respectively, and the tensile strength and elongation rate of which can reach the basic standard requirements for stainless-steel forgings.

Study on Arc Spraying Technique for Repairing Automobile Parts Based on Four Factors Experimental Method

2008 ◽  
Vol 373-374 ◽  
pp. 77-80
Author(s):  
L.G. Liu
Keyword(s):  
Wear Resistance ◽  
Steel Wire ◽  
High Carbon Steel ◽  
Air Pressure ◽  
Compressed Air ◽  
Arc Spraying ◽  
Test Machine ◽  
Feeding Speed ◽  
Wire Feeding ◽  
Coating Hardness

The wear-resisting property and hardness of arc-sprayed coatings is affected by spraying parameters, such as compressed air pressure, spraying current, spraying distance and wire feeding speed. In this paper, the four factors orthogonal experiment method was applied to optimize those four parameters. T12 high-carbon steel wire and SCDP-3 spray gun were used in the experiment. SKODA-Savin plunge wear test machine and the HB3000 Brinell hardness tester were used to measure the wear resistance and hardness of the coating. Based on the analyses of experimental data, the relationship curves of four factors versus the wear resistance and hardness were set up separately. The variance analysis of data shows that the gas pressure and spraying distance have the most significant effect on the wear resistance, wire feeding speed has the effect on the wear resistance, and the spraying current has less effect on the wear resistance. Four factors significantly affect the coating hardness, however the compressed air pressure has the greatest effect on the coating hardness. By the optimization analysis, the optimum parameters are obtained.

Influence of wire feeding speed on the melting behavior and formation of narrow-gap joint by laser welding with filler wire

2020 ◽  
Vol 32 (3) ◽  
pp. 032007
Author(s):  
Jihong Pu ◽  
Yong Zhao ◽  
Yumo Jiang ◽  
Jiasheng Zou ◽  
Shuming Song
Keyword(s):  
Laser Welding ◽  
Melting Behavior ◽  
Filler Wire ◽  
Narrow Gap ◽  
Feeding Speed ◽  
Wire Feeding

scholarly journals Development of laser welding of high strength aluminium alloy 2024-T4 with controlled thermal cycle

2020 ◽  
Vol 326 ◽  
pp. 08005
Author(s):  
Mete Demirorer ◽  
Wojciech Suder ◽  
Supriyo Ganguly ◽  
Simon Hogg ◽  
Hassam Naeem
Keyword(s):  
Laser Beam ◽  
Laser Welding ◽  
Heat Input ◽  
Thermal Cycle ◽  
Laser Beam Welding ◽  
Base Material ◽  
High Strength ◽  
Cooling Rates ◽  
Aa 2024 ◽  
Welding Processes

An innovative process design, to avoid thermal degradation during autogenous fusion welding of high strength AA 2024-T4 alloy, based on laser beam welding, is being developed. A series of instrumented laser welds in 2 mm thick AA 2024-T4 alloys were made with different processing conditions resulting in different thermal profiles and cooling rates. The welds were examined under SEM, TEM and LOM, and subjected to micro-hardness examination. This allowed us to understand the influence of cooling rate, peak temperature, and thermal cycle on the growth of precipitates, and related degradation in the weld and heat affected area, evident as softening. Although laser beam welding allows significant reduction of heat input, and higher cooling rates, as compared to other high heat input welding processes, this was found insufficient to completely supress coarsening of precipitate in HAZ. To understand the required range of thermal cycles, additional dilatometry tests were carried out using the same base material to understand the time-temperature relationship of precipitate formation. The results were used to design a novel laser welding process with enhanced cooling, such as with copper backing bar and cryogenic cooling.

Droplet transfer behavior of narrow gap laser wire filling welding

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940045 ◽  
Author(s):  
Z. Zhang ◽  
R. Wang ◽  
G. Gou ◽  
H. Chen ◽  
W. Gao
Keyword(s):  
Welding Speed ◽  
High Speed ◽  
Transition Period ◽  
High Speed Photography ◽  
Narrow Gap ◽  
Droplet Transfer ◽  
Transfer Behavior ◽  
Feeding Speed ◽  
Wire Feeding ◽  
Droplet Transition

In this paper, we study the droplet transition behavior of narrow gap laser wire filling welding under the condition of changing welding speed and wire feeding speed, and it was observed by high-speed photography. It was found that with the increase of welding speed, the frequency of droplet transfer was reduced and the transition period was prolonged. With the increase of wire feeding speed, the wire was not fully melted and finally inserted into the molten pool.

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