Weld Overlays Research Articles

Study on the Effect of Some Nanomodifiers on the Structure and the Corrosion Resistance of Overlay Weld Metal

Study on the Effect of Some Nanomodifiers on the Structure and the Corrosion Resistance of Overlay Weld Metal

Research on the properties of high chromium cast iron overlay welds deposited by tubular electrodes

In the paper, there were shown the results of research on the properties of overlay welds consisted of one and three layers deposited by three types of tubular electrodes of the Fe-Cr-C alloy, Fe-Cr-C-Nb-Mo-W-V alloy and composite consist of tungsten carbide particles in the Fe-Cr-C alloy matrix. The study of hardfacing deposits included: test of met- al-mineral abrasion resistance, metallographic examinations, analysis of chemical compo- sition, and hardness tests. The test of abrasive usage in metal-mineral friction was made according to the procedure A of the ASTM G 65 standard.

Mechanical and Electrochemical Properties of AISI4130/Austenitic Steels Dissimilar Welded Joints

The microstructure and mechanical properties of AISI 4130 and austenitic stainless-steel overlay dissimilar weld joint using Shield Metal Arc Welding (SMAW) process were investigated. Two different filler alloys have been employed (ENiCrFe-3 and E309 MoL-17). A type II boundary was formed close to the fusion boundary at the AISI 4130 side, due to the diffusion of carbon from the carbon steel (CS) base metal towards the weld metal. On the other side, the joints strength and hardness profiles were almost independent of filler alloy, where the highest hardness value was recorded in the area between the line fusion and the type II boundary. The polarization tests performed in different regions of the welded joints in H2SO4 solution (PH 4.7) revealed a high corrosion resistance of both filler alloys.

Technology of overlay laser welding of durable powdery into blade edge of miller

In this paper the laser welding technology features of wear-resistant powders on the hob’s cutting edge with laser radiation (LR) focus positioning control are described. It is shown that the quality of the welding process depends on the processing regimes, the energy characteristics of the laser technological complex (LTC), the positioning accuracy of the LR focus and its perpendicularity relative to the plane of a router bit. In this paper we deal with the questions of stabilization of LTC parameters and LR positioning as well.

Effect of Heat Input with Current Variation on Weld Overlay GTAW Method with ERNi-CI and ERNiFe-CI Fillers on Mechanical Properties and Micro Structure of Main Cap Product

Weld overlay is one of veneering method that do by welding on the base metal, so there is wear resistant, additional layer and corrosion resistant. Vibration load that work continue on engine block causing worn out on the components that be in the engine block, one of which occurs on both sides of the main cap that directly intersect to the engine block, however it needed an appropriate repair method that is weld overlay method that giving additional layer and wear resistant. This research is using filler ERNi-CI dan ERNiFe-CI on weld overlay method GTAW with current variation on main cap that made from nodular cast iron. Trials that did is conducted metallography and hardeness. The observation result of metallography show that micro structure in HAZ area and base metal contain more ferrite on the lower current. The more heat input however the more it decreasing hardeness value on weld metal and fusion line. This is caused by the more heat input, however cooling that happens become slow. The hardeness value of welding filler ERNiFe-CI is more high than the hardeness value of welding filler ERNi-CI effect of influence the numbers of nickel composition on the filler.

Properties and Structure of Deposited Nanocrystalline Coatings in Relation to Selected Construction Materials Resistant to Abrasive Wear.

Presented in this work are the properties and structure characteristics of MMA (Manual Metal Arc) deposited nanocrystalline coatings (Fe-Cr-Nb-B) applied to an iron nanoalloy matrix on an S355N steel substrate in relation to selected construction materials resistant to abrasive wear currently used in industry. The obtained overlay welds were subjected to macro and microscopic metallographic examinations; grain size was determined by X-ray diffraction (XRD), and chemical composition of precipitates was determined by energy-dispersive X-ray spectroscopy (EDS) during scanning electron microscopy (SEM). The size of the crystalline grains of the Fe-Cr-Nb-B nanocrystalline microstructure was analyzed using an Xpert PRO X-ray diffractometer. Analysis of the test results of the obtained layers of arc-welded Fe-Cr-Nb-B-type alloy confirmed that the obtained layers are made of crystallites with a size of 20 nm, which classifies these layers as nanocrystalline. The obtained nanocrystalline coatings were assessed by hardness and with the use of metal-mineral abrasion testing. The results of the coatings’ properties tests were compared to HARDOX 400 alloy steel.

Surface Hardening Low Alloy Structural Steel By Laser Welding

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Development of 25%Cr SMAW welding materials – development of high Cr ferritic overlay welding materials for recovery boiler

ABSTRACTIn place of the 18%Cr overlay welding material, which has been used for furnace water wall tubes of recovery boilers, a 25%Cr overlay welding material with good corrosion resistance has been newly developed. In consideration of dilution with a carbon steel tube, the Cr content of the new welding materials are designed to be more than 20%Cr. And in order to fine the grains of the weld metal, some elements, such as Nb, Al and Ti, are added to these welding materials. Mainly two types of welding materials, which have Austenite + Martensite + Ferrite of materials for the three-phase and fully ferritic materials, are examined. As results of weldability tests and bending properties, the fully ferritic welding materials are superior to the three-phase materials, respectively. On the point of the corrosion test, which are exposed into some smelt ashes obtained from the recovery boilers, the corrosion rate of the full ferritic material was confirmed to be the about half of that of 18%Cr overlay welding material. The 25%Cr overlay welding material was found to exhibit excellent corrosion resistance. This study introduces the development of 25%Cr ferritic welding material and methods for reliable overlay welding and examines the weldability, the bend property and the corrosion resistance of the 25%Cr overlay welded metal on tube.

Wear characteristics of STD61 tool steel according to repairing methods for Al porthole extrusion die: Direct metal deposition, welding, parent material

In the aluminum porthole extrusion process, excessive wear occurs on the surface of mandrel. This study evaluates the applicability of direct metal deposition (DMD), a 3D printing process, for repairing the hot aluminum extrusion die. The wear characteristics of three die repairing methods (parent-STD61, DMD-STD61, and welded-STD61) were compared through a high-temperature pin-on-disk wear test that considers the aluminum extrusion temperature. The results confirm that DMD results in superior wear characteristics when compared to overlay welding repair method. Further, the wear resistance of DMD-STD61 is similar to that of parent-STD61. The application of the DMD process is expected to yield a wear life similar to that of the parent STD61.

Experimental and numerical thermo-mechanical analysis of welding in a lined pipe

Experimental tests of multi-pass lined pipe welding are reported and a computational procedure for the determination of the history of temperature, strains and residual stresses is presented in this paper and validated against the experimental test results. The effect of the manufacturing process of the lined pipe on the thermo-mechanical analysis has been investigated. A 3-D FE model using ABAQUS has been developed to simulate a circumferential single-pass weld overlay (lap-weld) and two-pass girth welding (butt-weld). Thermal history and strain fields have been recorded during welding using thermocouples and high temperature strain gauges, respectively. Residual stresses have been measured using residual stress gauges, deep-hole drilling technique and the X-ray diffraction technique along the outer and inner surfaces of the lined pipe. The welding test has been repeated twice to assess the accuracy of thermal and mechanical measurements. Overall, very good correlation has been observed between the experimental and numerical results.

STUDY OF SELECTED USABLE PROPERTIES OF THE TOP LAYERS OF WELD OVERLAYS PRODUCED BY LASER TECHNOLOGY FOR APPLICATIONS IN THE POWER INDUSTRY

The paper presents the results of laboratory tests of test specimens produced by multi-layer laser padding alloy Stellit Co-6 powder on a substrate with heat-treated X22CrMoV12-1 alloy steel. Multilayer laser padding was performed on a TRUMPF TruLaser Cell 3008. The formed weld overlays surface was studied using an optical microscope. Selected usable properties, such as surface topography, microstructure, hardness and erosion resistance were studied. During the analysis, areas of cross-sections test specimens after multilayer laser padded, in the connection zone of the substrate material with weld overlay, no cracks and no discontinuities in weld overlay were found in the substrate. As a result of conducted experiments, regular, repetitive weld overlays with characteristic directional crystallization were obtained. A microstructure with different growth directions with respect to the surface of the substrate shaped coniferous dendrites was obtained. The hardness of the weld overlays was in the range from 420 to 620 HV0.1, and in the heat affected zone, in the range of 320 to 420 HV0.1. Significant increases in erosion resistance of the surface layer of Stellite type Co-6 weld overlay produced by laser in comparison with the parent material after hardening were found.

Low heat input gas metal arc welding for dissimilar metal weld overlays part II: the transition zone

Dissimilar metal weld overlays (DMWOL) of nickel base alloys on low alloy steel components are commonly used in the oil and gas, petrochemical, and power generation industries to provide corrosion and oxidation resistance in a wide range of service environments and temperatures. Traditionally, dissimilar weld overlays are produced using cold or hot wire gas tungsten arc welding. This study aims to identify and evaluate potential advantages of low heat input gas metal arc welding processes over the conventional gas tungsten arc welding in the production of dissimilar weld overlays. In order to evaluate the quality of these overlays regarding resistance against hydrogen-assisted cracking, their transition zone region is investigated in this part of the publication series. Metallurgical characterization, including energy-dispersive x-ray spectroscopy, is performed on Alloy 625/grade 22 steel overlays. The transition zone is characterized by a narrow planar growth zone and steep compositional gradients from the fusion boundary towards the weld metal. Evidence of low carbon contents in the planar growth zone, as well as for carbide precipitation in the cellular growth zone was found. The microstructure in the transition zone region of the fusion zone shows characteristics known to be suitable for good resistance against hydrogen embrittlement.

Effect of Method for Reduction of Residual Stress on Tensile Strength in Overlay Welding

Effect of Method for Reduction of Residual Stress on Tensile Strength in Overlay Welding

ANNEALING EFFECT ON MICROSTRUCTURE AND CHEMICAL COMPOSITION OF INCONEL 625 ALLOY

Our research focused on Inconel 625 weld overlays on 16Mo3 steel boiler pipes. The investigation focused on the characterization of changes in the microstructure and chemical composition after annealing. The annealing was performed for ten hours at temperatures from 600 to 1000°C. Changes in the microstructure were observed with a scanning and transmission electron microscope (SEM and TEM). The investigation was supplemented by hardness measurements.

TRENDS AND PERSPECTIVES OF HOT METHODS FOR RECONDITIONING OF WEAR DETAILS

The structure, trends and perspectives in development of hot methods as such used for reconditioning of worn details during the new Millennium are presented in the article as well as trends in production of consumables in industrially developing countries. The structure of welding methods is also shown giving priority to its development until 2020. It can be concluded that in the industrially developed countries by 2020 the share of arc welding will be stabilized at levels of 10-15% of the total number of methods used for weld overlaying of worn-out components. These figures will be 45-55 % and 7-9% for gas shielded and submerged arc welding respectively. The welding methods that will be prioritized for the period until 2020 will be gas shielded arc welding, contact, laser beam and hybrid welding.

Structure and Properties of Nickel Alloy Overlay Welds Plasma Cladded on Creep-Resistant Steel Tubes

Structure and Properties of Nickel Alloy Overlay Welds Plasma Cladded on Creep-Resistant Steel Tubes

Erosive-wear Resistance of Overlay Welds at High Temperature Under Simulation of Circulating Fluidized Bed Boiler

Erosive-wear Resistance of Overlay Welds at High Temperature Under Simulation of Circulating Fluidized Bed Boiler

A Study on the Development of Diagnosing System of Defects on Surface of Inner Overlay Welding of Long Pipes using Liquid Penetrant Test

A Study on the Development of Diagnosing System of Defects on Surface of Inner Overlay Welding of Long Pipes using Liquid Penetrant Test

Study on the effect of welding residual stress reduction method using ultrasonic vibration during overlay welding of SUS304 thin plate on material properties.

Study on the effect of welding residual stress reduction method using ultrasonic vibration during overlay welding of SUS304 thin plate on material properties.

The effects of different types of welding current on the characteristics of nickel aluminum bronze using gas metal arc welding

This study aims to investigate the effects of different types of welding current on the characteristics of Nickel Aluminum Bronze Alloy (NAB) such as microstructure, hardness, depth/width ratio and dilution by using Gas Metal Arc Welding (GMAW). The mechanized GMAW was employed for the bead on plate welding of NAB using 3 levels of heat input, 500-600 J/mm, 700-800 J/mm. and 800-900 J/mm with 2 types of welding current: standard and pulsed. The AWS.A5.7 ERCuNiAl solid wire and 100% argon shielding gas were applied. The results indicated that welding current types did not significantly affect the microstructures in the weld area and heat affected zone (HAZ).The hardness of welding from both welding current types were comparable with the average hardness of 160-180 HV in weld metal and 200-240 HV in the HAZ. Nevertheless the more heat per unit length (HI) was the higher depth/width ratio was. However, for pulsed current, the metal was transfer form solid wire to the NAB during the peak current of pulsed current resulting in deeper penetration but with higher dilution ratio compared to standard current. This could indicate that the pulsed current could be more appropriated for groove welding while the standard current for the built-up overlay welding.