Equal Resistant to Wear Blades Used in Rough Exploitation Conditions

2018 ◽  
Vol 1146 ◽  
pp. 22-26
Author(s):  
Daniel Tihanov Tanasache ◽  
Daniela Dinica ◽  
Emilia Florina Binchiciu ◽  
Horia Binchiciu
Keyword(s):  
Working Conditions ◽  
Mechanical Fatigue ◽  
Base Materials ◽  
Wear Protection ◽  
Welded Structure ◽  
Protection Systems ◽  
Resistance To Wear ◽  
Low Alloyed Steel ◽  
Welding Procedure ◽  
Self Protection

The paper presents representative aspects of the blades and the characterisation of excavator blades, namely frontal loader in the quall resistance to wear version. In exploitation the active surfaces of the blades are subjected to wear through abrasion under high and medium pressure, combined with mechanical fatigue with variable cycles. Retiring the blades is determined by significant degradation of the side zones. The solution developed in order to confront the mentioned phenomena is of modular type, namely equipping the blades with intelligent protection and self-protection systems to wear, which are deposited by cladding with welding on the supports. The blades support is made out of low alloyed steel, which have a controlled hardness and are micro alloyed with boron. The rods used to develop the wear protection systems are type Fe-25%Cr-4%W-Ti-V-La which deposit layers that have a minimum hardness of 55HRC. The challenges solved are related to welding compatibility, in working conditions, of the base materials and the welding ones, through manual electric welding procedure and respective deformation due to residual tensions in the welded structure.

Research Regarding Wear Protection in Sever Exploitation Condition of Crusher Jaws

2015 ◽  
Vol 1128 ◽  
pp. 390-393
Author(s):  
Daniel Tihanov Tanasache ◽  
Emilia Binchiciu ◽  
Carmen Florea ◽  
Victor Geanta ◽  
Horia Binchiciu
Keyword(s):  
High Pressure ◽  
Active Surface ◽  
Protection System ◽  
Innovative Technology ◽  
Diffusible Hydrogen ◽  
Wear Area ◽  
Base Materials ◽  
Wear Protection ◽  
Self Protection ◽  
Fall Deposits

The paper presents a new innovative technology that is experimented to protect from wear crusher jaws that grind basalt aggregates. These are subjected, in exploitation, at the active surface level, to complex requests of wear at abrasion under high pressure combined with fatigue at high efforts. Actual developed stage in casted form from hardened steels present the disadvantage of being sensitive to excavation, pitting type, wear, in hard areas or in those with segregation at the crystalline grain limit. Fighting the above mentioned phenomena’s if accomplished by loading through welding on the jaws active surfaces layers with proper proprieties to obtain intelligent self-protection to wear systems. The thickness of the deposits is determined experimental based on minimizing the tensions on the base metal. The position and geometry of the wear self-protection system were established on data collected from crusher jaws used in exploitation, in Bata quarry, Romania. The morphology of the wear self-protection system layers is developed depending on the type of wear it will encounter during exploitation. Thus in the central impact and wear area, under abrasion and high pressure, depositing the self-protection at wear system consists of alternative rows of tough, hardened, with small grain size materials; in the side areas, subjected to the constant grinded material fall, deposits developed with tough materials. To assure the manufacturing process for the new products, at Sudotim AS Timișoara, we experimentally adapted rods SUDODUR CWTV and SUDINOX CN according to quality-price conditioned imposed as well as its lifespan in exploitation. Requests followed optimizing the product based on minimum price, minimum alloying level and low level of diffusible hydrogen and high purity of base materials.

scholarly journals Lightweigt supportive wear protection systems against erosive wear by fine particles

2018 ◽  
Vol 63 (2) ◽  
pp. 79-92
Author(s):  
Volker Wesling ◽  
Rolf Reiter ◽  
Marvin Hecht
Keyword(s):  
Fine Particles ◽  
Erosive Wear ◽  
Wear Protection ◽  
Protection Systems

Efficient Process to Develop Self-Sharpening Active Elements

2020 ◽  
Vol 1157 ◽  
pp. 188-193
Author(s):  
Victor Geantă ◽  
Ionelia Voiculescu ◽  
Emilia Binchiciu ◽  
Daniela Maria Iovanaș ◽  
Radu Ştefănoiu ◽  
...  
Keyword(s):  
Steel Substrate ◽  
High Hardness ◽  
Maximum Lifespan ◽  
Good Resistance ◽  
Metal Elements ◽  
Efficient Process ◽  
Active Elements ◽  
In Series ◽  
Resistance To Wear ◽  
Low Alloyed Steel

The paper presents technologies for the manufacturing of modulated bi-metal elements, used as interchangeable reinforcement, according to patent RO129865. The bi-metal was developed by surface build-up of functional layers that have increased hardness, on a low alloyed steel substrate, so as to ensure maximum lifespan in exploitation. Welded layers deposited on active areas has a thickness of 3 mm and have high hardness (about 50-60 HRC) in order to ensure a good resistance to wear by abrasion, possibly combined with fatigue, erosion or corrosion. The modulated elements sizes are equal to or higher than the wear additions, up to 10%, being dimensioned on the principles of preventive-repetitive maintenance. The interchangeable bi-metal elements are welded on the steel components of machines, used for hot or cold processing of parts and semi-finished products manufactured in series.

Preventive Repetitive Maintenance Applications in the Field of High Wear Subjected Surfaces

2019 ◽  
Vol 1153 ◽  
pp. 113-118
Author(s):  
Daniel Tihanov-Tănăsache ◽  
Vlad Alexandru Florea ◽  
Daniela Dinica ◽  
Emilia Florina Binchiciu ◽  
Nicușor Alin Sîrbu
Keyword(s):  
Cutting Tools ◽  
High Volume ◽  
Basaltic Rock ◽  
Recent Change ◽  
Additional Material ◽  
High Productivity ◽  
Active Surfaces ◽  
Wear Protection ◽  
Protection Systems ◽  
Definition Of

The paper presents three applications for maintenance of soil processing tools, achieved by loading through welding of rough layers, of the active surfaces, highly subjected to wear. To achieve this objective we used the preventive repetitive maintenance principles and the concept of fair definition of the wear additional material, in such a way that the rendering activity of active surfaces with the additions will take place in the „dead time” for the manufacturing operation. In concrete situations, of preparing and processing soil, to assure the good functioning of cutting tools in contact with the soil to be processed, in quarries that extract and process basaltic rock aggregates we used a common process of depositing wear protection layers or intelligent self-protection systems, by melting with electric arc of new welding materials that assure in the deposited metal, type Fe-25%Cr-4%W-1%V-Ti-La, hardness of approx. 55HRC and a good welding compatibility with a large palette of low alloyed steels or micro-alloyed with boron, with hardness up to 400 HB. The structure and morphology of the deposits are type austenitic with a high volume of complex carbides of chromium, wolfram and vanadium and reduced, clean inter-crystalline areas, determined by the presence of lanthanides, fact that assures the intelligent protection systems a high tenacity and a good resistance to abrasion wear, specific clay soil with a high content of quartz sand, present in the vest area. The recent change in soil processing systems, by introducing new equipment, determined a rise in wear conditions, especially for scarify and plow coulters teeth and hoeing digger used for growing crops, respectively of useful technologies used in exploitation in conditions of high productivity with low costs.

Experimental Research on Modern Methods of Welding Pipelines Using Base Materials X60 and X70

2014 ◽  
Vol 216 ◽  
pp. 298-303
Author(s):  
Camelia Maria Hanea ◽  
Radu Iovanas ◽  
Ionut Claudiu Roată ◽  
Alexandru Pascu
Keyword(s):  
Experimental Research ◽  
Fracture Strength ◽  
Welded Joints ◽  
Weld Bead ◽  
Automatic Welding ◽  
Base Materials ◽  
Modern Methods ◽  
Welding Procedure

The aim of the research is to highlight the properties of the welded joints of the steels that are used for mains X60 and X70. X60 and X70 steels were welded by automatic welding procedure (STT) at the root and also by automatic MIG procedure for the filling layers. Thereby an increase between 6 15 [%] of the weld bead hardness was obtained in the case of the X 60 steel welding. An increase of bead fracture strength was also noticed from 570 [N/mm2] X 60 steel to 646 [N/mm2] X70 steel.

Realization of Milling Teeth for Earthmoving Works by MIG / MAG Cold Metal Loading

2015 ◽  
Vol 1128 ◽  
pp. 230-235
Author(s):  
Razvan Florin Iovanas ◽  
Daniela Maria Iovanas ◽  
Teodor Machedon-Pisu
Keyword(s):  
Tungsten Carbide ◽  
Direct Contact ◽  
Metal Loading ◽  
Resistance To Wear ◽  
Cold Metal ◽  
Welding Procedure ◽  
Metal Welding ◽  
Earthmoving Equipment

The earthmoving equipment milling teeth of the are made of a cutting tip (made of tungsten carbide) which, by means of the direct contact with the environment, creates the effect of penetration, dislocation and body (of alloyed steels), designed so as to achieve a spinning effect around its own axis for a uniform wearing of the tooth. The researches carried out and presented in this paper were meant to increase the durability and reliability of the milling teeth by increasing the resistance to wear of the tapered parts of their tips by means of welding build-up, using the MIG/MAG-Cold metal welding procedure, with circular welding seams, using special fillers.

Reliability-Based Optimization of Multi-Component Welded Structures

1994 ◽  
Vol 116 (4) ◽  
pp. 233-238 ◽  
Author(s):  
E. H. Cramer ◽  
P. Friis-Hansen
Keyword(s):  
Crack Initiation ◽  
Weld Seam ◽  
Fatigue Cracks ◽  
Design Quality ◽  
Welded Structures ◽  
Weld Defects ◽  
Initial Design ◽  
Welded Structure ◽  
Welding Procedure

Sufficient safety of welded structures against fatigue damage is achieved through the use of several safety procedures, design of the structure, quality control of the welding procedure during fabrication, and inspection for fatigue cracks with subsequent repair of detected cracks. Each safety procedure has a certain cost, and it is important to minimize the total expected cost over the lifetime of the structure. The present paper presents a probability-based optimization procedure defining optimal initial design, quality of welding procedure at fabrication, time of inspections, quality of inspections, and length of weld to be inspected at each inspection for a continuous weld. The cost considered in the optimization is cost-related to initial design, cost of fabrication, cost of inspection, expected repair cost, and expected failure cost. The probabilistic optimization problem is formulated for a homogeneous continuously welded structure containing hazardous material for which no leakage is permissible. The weld seam considered has multiple potential crack initiation sites from weld defects, where all the crack initiation sites are exposed to the same stochastic loading condition. Two models are applied to define the distribution of weld defects over the weld seam: a model where the locations of the crack initiation sites are known, and a model where the locations and number of crack initiation sites are unknown and described through a homogeneous Poisson distribution process. Uncertainties in the long-term stochastic load process, the fatigue strength, and the crack size of the different initial defects are considered in the procedure.

scholarly journals So Far So Close: Irish and Mexican Migrant Experience in the United States

Oceánide ◽  
2020 ◽  
Vol 13 ◽  
pp. 111-119
Author(s):  
José Antonio Gurpegui Palacios
Keyword(s):  
United States ◽  
Settlement Patterns ◽  
The United States ◽  
Protection Systems ◽  
Mexican Migrant ◽  
And Behaviors ◽  
Migratory Experience ◽  
Self Protection

Irish and Mexicans conform two singular migratory groups in the United States. Nowadays it is possible to find important differences between both groups that could lead to think that in both cases the migratory experience responded to different patterns. However, as we empirically analyze the historical, sociological, and political roots of the arrival and settlement of Irish and Mexicans in the United States, it is possible to verify that the two models are not so different. In both cases similar reasons and behaviors are reproduced in aspects related to why they migrated, to settlement patterns, the complex relations with the hegemonic group, or self-protection systems.

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