Influence of Weld Parameter on Penstock Joint of B610CF-16MnR Steel

2013 ◽  
Vol 675 ◽  
pp. 270-274
Author(s):  
Yun Chun Chen ◽  
Wen Min Liu ◽  
Hou Sen Yang ◽  
Tian Hui Zhang ◽  
Pei Jun Yan
Keyword(s):  
Mechanical Property ◽  
Impact Toughness ◽  
Weld Metal ◽  
Weld Joint ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Arc Welding ◽  
Experimental Results ◽  
Welding Method ◽  
Weld Heat

Weld parameter is an important factor affecting micrographic structure and mechanical properties of weld joints. It was investigated by metallographic experiments and mechanical property experiments for the influence of weld heat input on dissimilar steel weld joint of penstock using B610CF and 16MnR steel in water conservancy and hydropower engineering using shielded metal arc welding method and mixed active gas arc welding method. Metallographic experimental results show that in weld metal with the increase of weld heat input the quantity of bainite decreases and crystalline grain is larger when using the same welding method; but in both B610CF and 16MnR steel heat affected zone, there is no distinct difference in microstructure. Mechanical property experimental results show that in weld metal with the increase of weld heat input the impact toughness decreases when using the same welding method, but in both B610CF and 16MnR heat affected zone, there is less difference in impact toughness; and there is no distinct difference in tensile strength and plasticity of weld joint. So moderate weld heat input is recommended.

Influence of Weld Heat Input on Weld Joint between B610CF and 16MnR Steel

2010 ◽  
Vol 154-155 ◽  
pp. 421-424
Author(s):  
Tian Hui Zhang ◽  
Hong Cai Fu ◽  
Wen Min Liu ◽  
Yun Chun Cheng ◽  
Ren Ping Xu
Keyword(s):  
Impact Toughness ◽  
Weld Joint ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Experimental Results ◽  
Distinct Difference ◽  
Shielded Metal Arc Welding ◽  
Metal Arc Welding ◽  
The Impact ◽  
Weld Heat

The influence of weld heat input on weld joint between B610CF and 16MnR steel using shielded metal arc welding method was investigated by metallographic experiment and mechanical properties experiment. Metallographic experimental results show that in welded metal with the increasing of weld heat input the quantity of bainite is decreased and crystalline grain is larger; but in both B610CF and 16MnR steel heat affected zone, with the increasing of weld heat input there is no distinct difference in microstructure. Mechanical property experimental results show that in weld metal with the increasing of weld heat input the impact toughness decreases, but in both B610CF and 16MnR heat affected zone, there is less difference in impact toughness; and there is no distinct difference in tensile strength and plasticity of weld joint, which is consistent with the metallographic experiment results.

Microstructures and Mechanical Properties of Weld Joint between B610CF and 16MnR Steel

2010 ◽  
Vol 139-141 ◽  
pp. 352-355 ◽  
Author(s):  
Tian Hui Zhang ◽  
Hong Cai Fu ◽  
Pei Jun Yan ◽  
Fang Wei Jin ◽  
Qiong Wang
Keyword(s):  
Mechanical Property ◽  
Weld Joint ◽  
Heat Affected Zone ◽  
Arc Welding ◽  
Welding Parameters ◽  
Shielded Metal Arc Welding ◽  
Weld Joints ◽  
Welding Method ◽  
Metal Arc Welding ◽  
Strength And Plasticity

Weldability analysis, metallographic experiments and mechanical property experiments were carried out on weld joint between B610CF and 16MnR steel using shielded metal arc welding method and mixed active-gas arc welding method. Weldability analysis shows that the weld joint has some tendency to cold crack, and preheat is needed before welding. Metallographic results show that there are ferrite and bainite in weld metal, and in heat-affected zone of B610CF side there are ferrite and bainite, on which there is much dispersed slight Fe3C, and in heat-affected zone of 16MnR side there are ferrite, pearlite. There is no quenching microstructure resulting in crack in weld joint. From mechanical property results, it can be concluded that the weld joints have excellent impact toughness at low temperature and the tensile strength and plasticity of weld joints is matched to the ones of 16MnR steel. So the welding parameters in this paper are appropriate to get qualified weld joints.

Effect of hot-wire on microstructure and mechanical property in weld metal formed with CO2gas shielded arc welding method

2014 ◽  
Vol 29 (6) ◽  
pp. 409-416
Author(s):  
Tadahisa Tsuyama ◽  
Kiyomichi Nakai ◽  
Keita Noumaru ◽  
Tatsuaki Sakamoto ◽  
Sengo Kobayashi
Keyword(s):  
Mechanical Property ◽  
Weld Metal ◽  
Arc Welding ◽  
Hot Wire ◽  
Welding Method ◽  
Microstructure And Mechanical Property

scholarly journals Study of Microstructure 304L Austenitic Stainless Steel Weld Deposited by GTAW for Root Pass and SMAW for Filler Passes

2018 ◽  
Vol 7 (2) ◽  
pp. 21-25
Author(s):  
Harsimranjit Singh Randhawa
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Weld Metal ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Arc Welding ◽  
Rear Side ◽  
Gas Tungsten Arc ◽  
Metal Arc Welding ◽  
Gtaw Process

In the present experimentation, a 10mm thick austenitic stainless steel plate type 304L is welded using single V-joint configuration and approaching the joint from one side. Back purging has been employed to protect the rear side of the root pass weld metal against oxidation. The root pass has been deposited by gas tungsten arc welding (GTAW) process. The filler passes are deposited by shielding metal arc welding (SMAW) process at 90A and 120A welding currents giving heat inputs of the order of 0.679 and 0.933 kJ/mm respectively while the speed of weld deposition was kept practically constant. The results of experimentation show that the micro-hardness of weld metal and heat affected zone (HAZ) of weldments produced at lower heat input is higher whereas impact toughness value of weld metal and HAZ is lower than that of joints produced at higher heat input. The microstructure of weld metal and heat affected zone developed at lower weld heat input has been observed finer in comparison to that resulted at higher heat input. This has primarily happened due to a higher rate of cooling at low heat input.

Investigations on Impact Toughness and Microstructure Characteristics of Gas Metal Arc Welded HY-80 Steel Plate

2019 ◽  
Vol 964 ◽  
pp. 68-79 ◽  
Author(s):  
Herry Oktadinata ◽  
Winarto Winarto ◽  
Eddy S. Siradj
Keyword(s):  
Impact Toughness ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Arc Welding ◽  
Steel Plate ◽  
Gas Metal Arc Welding ◽  
Hardness Test ◽  
Fusion Line ◽  
High Yield ◽  
The Impact

HY-80 is the high yield steel that commonly used for naval ship and submarine. Arc welding operations are critical stage in fabrication of this steel. During welding, the problem may occur in the heat affected zone due to the high temperature makes the microstructure suddenly changes. Coarse grain heat affected zone (CGHAZ) develops close to the fusion line, steel become brittle and the impact toughness decrease. This research investigated the microstructure of HY-80 weldment, impact toughness at sub-zero temperatures, and hardness distribution along cross-section of the welded joint. ER100S welding wire, Ar+10%CO2 shielding gas mixture and single V-groove butt joint with an angle of 60° were selected prior to welding. 12 mm thick of HY-80 steel plate that used in this experiment was multipass welded by gas metal arc welding (GMAW). Impact toughness at sub-zero temperature, hardness and microstructure evolutions of base metal (BM), heat affected zone (HAZ) and weld metal (WM) were observed. The result shows at a temperature of-80 °C, the lowest impact toughness was measured at WM (61 J) as compared to fusion line (101 J) and BM (217 J). The hardness measurement shows the maximum hardness was measured in CGHAZ followed WM and BM. Vickers hardness test result of weld joint at bottom area are higher than top area. It may caused of the low heat input of back weld compared to other passes. The lower heat input, cooling rate increased and initiate the formation of hard phase. The microstructure of WM shows acicular ferrites and non-metallic inclusions, these inclusions may deteriorate the impact toughness.

scholarly journals Effects of Microstructure on Mechanical Property in Weld Metal Formed with the Hot-Wire Method Applying Ordinal CO2 Gas Shielded Arc Welding Method

2013 ◽  
Vol 99 (7) ◽  
pp. 468-474 ◽  
Author(s):  
Tadahisa Tsuyama ◽  
Kiyomichi Nakai ◽  
Mei Akiyama ◽  
Bunpei Takahashi ◽  
Tatsuaki Sakamoto ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Weld Metal ◽  
Arc Welding ◽  
Gas Shielded Arc Welding ◽  
Hot Wire ◽  
Co2 Gas ◽  
Welding Method ◽  
Wire Method

Influence of Thermal Simulated and Real Tandem Submerged Arc Welding Process on the Microstructure and Mechanical Properties of the Coarse Grained Heat Affected Zone

2011 ◽  
Vol 110-116 ◽  
pp. 3191-3198
Author(s):  
Sadegh Moeinifar
Keyword(s):  
Grain Boundaries ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Arc Welding ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Rolled Plate ◽  
Arc Welding Process ◽  
Submerged Arc ◽  
Tandem Submerged Arc Welding

The high-strength low-alloy microalloyed steel was procured as a hot rolled plate with accelerated cooling. The Gleeble thermal simulated process involved heating the steel specimens to the peak temperature of 1400 °C, with constant cooling rates of 3.75 °C/s and 2 °C/s to room temperature. The four-wire tandem submerged arc welding process, with different heat input, was used to generate a welded microstructure. The martensite/austenite constituent appeared in the microstructure of the heat affected zone region for all the specimens along the prior-austenite grain boundaries and between bainitic ferrite laths. The blocky-like and stringer martensite/austenite morphology were observed in the heat affected zone regions. The martensite/austenite constituents were obtained by a combination of field emission scanning electron microscopes and image analysis software The Charpy absorbed energy of specimens was assessed using Charpy impact testing at-50 °C. Brittle particles, such as martensite/austenite constituent along the grain boundaries, can make an easy path for crack propagation. Similar crack initiation sites and growth mechanism were investigated for specimens welded with different heat input values.

Effects of oxygen content on microstructure and impact toughness of high heat input flux-cored wire weld metals

2018 ◽  
Vol 115 (4) ◽  
pp. 410
Author(s):  
Fengyu Song ◽  
Yanmei Li ◽  
Ping Wang ◽  
Fuxian Zhu
Keyword(s):  
Grain Size ◽  
Impact Toughness ◽  
Weld Metal ◽  
Oxygen Content ◽  
Heat Input ◽  
High Heat ◽  
Cored Wire ◽  
Weld Metals ◽  
High Heat Input ◽  
The Impact

Three weld metals with different oxygen contents were developed. The influence of oxygen contents on the microstructure and impact toughness of weld metal was investigated through high heat input welding tests. The results showed that a large number of fine inclusions were formed and distributed randomly in the weld metal with oxygen content of 500 ppm under the heat input condition of 341 kJ/cm. Substantial cross interlocked acicular ferritic grains were induced to generate in the vicinity of the inclusions, primarily leading to the high impact toughness at low temperature for the weld metal. With the increase of oxygen content, the number of fine inclusions distributed in the weld metal increased and the grain size of intragranular acicular ferrites decreased, which enhanced the impact toughness of the weld metal. Nevertheless, a further increase of oxygen content would contribute to a great diminution of the austenitic grain size. Following that the fraction of grain boundary and the start temperature of transformation increased, which facilitated the abundant formation of pro-eutectoid ferrites and resulted in a deteriorative impact toughness of the weld metal.

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