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.

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.

Room-Temperature Sealing of Microcavities by Cold Metal Welding

2009 ◽  
Vol 18 (6) ◽  
pp. 1318-1325 ◽  
Author(s):  
A. Decharat ◽  
Junchun Yu ◽  
M. Boers ◽  
G. Stemme ◽  
F. Niklaus
Keyword(s):  
Room Temperature ◽  
Cold Metal ◽  
Metal Welding

scholarly journals Analysis of the oscillation behavior during ultrasonic welding of EN AW-1070 wire strands and EN CW004A terminals

2021 ◽  
Author(s):  
Andreas Gester ◽  
Guntram Wagner ◽  
Pascal Pöthig ◽  
Jean Pierre Bergmann ◽  
Marco Fritzsche
Keyword(s):  
Fundamental Frequency ◽  
Low Frequency ◽  
Front Face ◽  
Research Groups ◽  
Welding Zone ◽  
Compaction Behavior ◽  
Weld Time ◽  
Welding Procedure ◽  
Metal Welding ◽  
Electrical Connections

AbstractFor fulfilling the demand of durable yet lightweight electrical connections in transportation industries, ultrasonic metal welding (USMW) sees widespread use in these branches. As the ultrasound oscillations utilized in the welding procedure occur at a range of only a few micrometers at frequencies of 20–100 kHz for an overall duration of only 50–1500 ms, it is not possible to observe the compaction behavior with the bare eye. This paper focusses on investigating the oscillation behavior of the horn, the anvil, and the joining partners during the welding procedure by utilizing an array of synchronized laser vibrometers and performing welds with incrementing time stages. The oscillation data is correlated with temperature measurements in the welding zone as well as tensile testing results. Inter alia the formation of sidebands at the fundamental frequency as well as 2nd- and 3rd-order harmonics has been observed for the anvil, terminal, and wire front face when exceeding optimal weld time which would lead to maximum joint strength. Following the assumption of other research groups, the cause of these sidebands could be a change in relative motion of these components. As the terminal is slipping with increasing weld time, it could be assumed that the reason for the sidebands is low-frequency movement of the anvil, modulated onto the fundamental frequency, additionally indicating successful bonding of the stranded wire and the terminal. Furthermore, this slipping of the terminal on the anvil could lead to increased wear of the anvil knurls.

scholarly journals Dissimilar Non-Ferrous Metal Welding: An Insight on Experimental and Numerical Analysis

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1486
Author(s):  
Jeyaganesh Devaraj ◽  
Aiman Ziout ◽  
Jaber E. Abu Qudeiri
Keyword(s):  
Large Scale ◽  
Gas Metal Arc Welding ◽  
Ferrous Metal ◽  
Nonferrous Metals ◽  
Dissimilar Welding ◽  
Welding Parameters ◽  
Cold Metal Transfer ◽  
Friction Stir ◽  
Cold Metal ◽  
Metal Welding

In recent years Gas Metal Arc Welding (GMAW) technology has expanded its functionalities in various areas which have further motivated its usage in several emerging manufacturing industries. There are several issues and challenges associated with this technology, especially in dissimilar metal welding (DMW). One of the predominant challenges is selecting appropriate welding parameters which influence the efficiency of this technology. To explore several modern advancements in this expertise, this paper has done an exclusive survey on various standards of GMAW and its variants for selecting suitable parameters for welding dissimilar nonferrous metals. This review summarizes various experimental and numerical results along with related illustrations to highlight the feasibility of welding dissimilar nonferrous metals using traditional GMAW and investigations on advanced GMAW processes such as cold metal transfer (CMT) and pulsed GMAW (P-GMAW). Simulation and modeling of nonferrous DMW have identified several research gaps and modeling problems. Researchers and manufacturers can use this review as a guideline to choose appropriate welding parameters to implement GMAW and its variants for non-ferrous dissimilar welding. It found that by controlling the heat input and effective post-heat treatments, adequate joint properties can be achieved. Automated large -scale manufacturing will widen the utilization scope of GMAW and avoid some costly methods such as laser welding, ultrasonic welding, and friction stir welding etc.

Saturn's E, G and F rings: modulated by the plasma sheet

1984 ◽  
Vol 75 ◽  
pp. 597
Author(s):  
E. Grün ◽  
G.E. Morfill ◽  
T.V. Johnson ◽  
G.H. Schwehm
Keyword(s):  
Solar Wind ◽  
Direct Contact ◽  
Transport Processes ◽  
Time Variable ◽  
Dust Particles ◽  
Spatial Diffusion ◽  
Drag Forces ◽  
Orbit Perturbation ◽  
Time Variations ◽  
F Ring

ABSTRACTSaturn's broad E ring, the narrow G ring and the structured and apparently time variable F ring(s), contain many micron and sub-micron sized particles, which make up the “visible” component. These rings (or ring systems) are in direct contact with magnetospheric plasma. Fluctuations in the plasma density and/or mean energy, due to magnetospheric and solar wind processes, may induce stochastic charge variations on the dust particles, which in turn lead to an orbit perturbation and spatial diffusion. It is suggested that the extent of the E ring and the braided, kinky structure of certain portions of the F rings as well as possible time variations are a result of plasma induced electromagnetic perturbations and drag forces. The G ring, in this scenario, requires some form of shepherding and should be akin to the F ring in structure. Sputtering of micron-sized dust particles in the E ring by magnetospheric ions yields lifetimes of 102to 104years. This effect as well as the plasma induced transport processes require an active source for the E ring, probably Enceladus.

High-pressure freezing and freeze substitution of plant tissue

1992 ◽  
Vol 50 (1) ◽  
pp. 748-749
Author(s):  
William P. Sharp ◽  
Robert W. Roberson
Keyword(s):  
High Pressure ◽  
Cell Structure ◽  
Leaf Tissue ◽  
Freeze Substitution ◽  
Crystal Formation ◽  
Ice Crystal ◽  
High Pressure Freezing ◽  
Cell Components ◽  
Cold Metal ◽  
Brome Grass

The aim of ultrastructural investigation is to analyze cell architecture and relate a functional role(s) to cell components. It is known that aqueous chemical fixation requires seconds to minutes to penetrate and stabilize cell structure which may result in structural artifacts. The use of ultralow temperatures to fix and prepare specimens, however, leads to a much improved preservation of the cell’s living state. A critical limitation of conventional cryofixation methods (i.e., propane-jet freezing, cold-metal slamming, plunge-freezing) is that only a 10 to 40 μm thick surface layer of cells can be frozen without distorting ice crystal formation. This problem can be allayed by freezing samples under about 2100 bar of hydrostatic pressure which suppresses the formation of ice nuclei and their rate of growth. Thus, 0.6 mm thick samples with a total volume of 1 mm3 can be frozen without ice crystal damage. The purpose of this study is to describe the cellular details and identify potential artifacts in root tissue of barley (Hordeum vulgari L.) and leaf tissue of brome grass (Bromus mollis L.) fixed and prepared by high-pressure freezing (HPF) and freeze substitution (FS) techniques.

Cold metal working

1932 ◽  
Vol 11 (4) ◽  
pp. 150
Author(s):  
H.G. Povey
Keyword(s):  
Metal Working ◽  
Cold Metal
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