scholarly journals RESEARCH ON ATTRIBUTES OF WELDED LAYERS OF COATED ELECTRODES INFLUENCED BY BORON

2021 ◽  
Vol 13 (0) ◽  
pp. 1-4
Author(s):  
Artūras Mastebrockis ◽  
Valentinas Varnauskas ◽  
Irmantas Gedzevičius ◽  
Giedrius Garbinčius
Keyword(s):  
Experimental Study ◽  
Abrasion Resistance ◽  
Welding Process ◽  
Iron Boride ◽  
Standard Base ◽  
Metal Welding ◽  
Coated Electrodes

The article deals with the properties of coated electrodes for metal welding produced by UAB Anykščių varis. The newly manufactured electrodes use a standard base putty with a different ferrobor concentration. The main highlights of this work are the search and analysis of literature sources to elucidate the effect of feroboron concentration on the welding process, the performance of the experimental study and analysis of the obtained results to determine the influence of iron boride on the hardness and abrasion resistance of welded metal.

scholarly journals ЭКСПЕРИМЕНТАЛЬНОЕ ИССЛЕДОВАНИЕ ПРОЦЕССА СВАРКИ ТРУБНЫХ ЗАГОТОВОК ПРИ ВИБРАЦИОННОМ ВОЗДЕЙСТВИИ

SWorldJournal ◽  
2018 ◽  
pp. 55-63
Author(s):  
Валерий Балакин ◽  
Татьяна Кадильникова ◽  
Святослав Савкин ◽  
Анастасия Кадильникова
Keyword(s):  
Experimental Study ◽  
Residual Stresses ◽  
Welding Process

The article proposes an effective way to reduce the residual stresses arising in the welded seams of pipes, based on the use of vibration in the welding process. The experimental study was divided into the following stages: welding of longitudinal preform

Process Monitoring in Ultrasonic Metal Welding of Lithium Batteries by Power Signals

2021 ◽  
pp. 1-22
Author(s):  
Xinhua Shi ◽  
Lin Li ◽  
Suiran Yu ◽  
Lingxiang Yun
Keyword(s):  
Electric Power ◽  
Process Monitoring ◽  
Lithium Batteries ◽  
Welding Process ◽  
Ultrasonic Metal Welding ◽  
Isometric Transformation ◽  
Welding Defects ◽  
Different Types ◽  
Metal Welding ◽  
Welding Processes

Abstract Ultrasonic metal welding is one of the key technologies in manufacturing lithium batteries, and the welding quality directly determines the battery performance. Therefore, an online welding process monitoring system is critical in identifying abnormal welding processes, detecting defects, and improving battery quality. Traditionally, the peak welding power is used to indicate abnormal process signals in welding process monitoring systems. However, since various factors have complex impacts on the electric power signals of ultrasonic welding processes, the peak power is inadequate to detect different types of welding defects. Therefore, a signal pattern matching method is proposed in this study, which is based on the electric power signal during the entire welding process and thus is capable of identifying abnormal welding processes in various conditions. The proposed method adopts isometric transformation and homogenization as signal pretreatment methods, and Euclidean distance is used to calculate the similarity metric for signal matching. The effectiveness and robustness of the proposed method are experimentally validated under different abnormal welding conditions.

Ultrasonic Rapid Manufacturing: Implementation and Thermo-Mechanical Analysis

2002 ◽  
Author(s):  
Shailendra Yadav ◽  
Charalabos Doumanidis
Keyword(s):  
Temperature Effects ◽  
Welding Process ◽  
Mechanical Analysis ◽  
Ultrasonic Welding ◽  
Solid Metal ◽  
Rapid Manufacturing ◽  
Mechanical Process ◽  
Ultrasonic Metal Welding ◽  
Metal Parts ◽  
Metal Welding

This paper addresses a novel non-thermal Ultrasonic Rapid Manufacturing (URM), for layered parts based on Ultrasonic Metal Welding (USW). Its laboratory implementation, automation and integration are described first. The thermo-mechanical process aspects (i.e. heat generation and resulting temperature effects) during each cycle of ultrasonic welding are then studied. The technical advantages of ultrasonic welding process, including fabrication of dense, full-strength functional solid metal parts, multi-material composites, and active parts with embedded intelligent components and electronic, mechatronic, optic and fluidic structures, are examined.

scholarly journals Fatigue characteristics of welded high strength steel in the low cycle region of loading

2019 ◽  
Vol 254 ◽  
pp. 07002
Author(s):  
Peter Kopas ◽  
Milan Sága ◽  
Marián Handrik ◽  
Milan Vaško ◽  
Lenka Jakubovičová
Keyword(s):  
Low Frequency ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Loading Frequency ◽  
Fuel Savings ◽  
Fatigue Characteristics ◽  
Structural Parts ◽  
The One ◽  
Metal Welding

Automotive industry is the one of the most rapidly developing sector of engineering. Using of new, progressive materials can make significant benefits because of growing durability and reducing weight of structural parts, which can lead to the materials and fuel savings. The authors of this paper discuss fatigue characteristics on arc metal welding process of high strength steels STRENX 700MC obtained in low cycle region (N approximate to 1.10(3) divided byN= 1.10(7) cycles) at low-frequency loading (frequency approximate to 35 Hz, T = 20 +/5 degrees C,R= -1). Authors compares results of their own experimental works and subsequently discus these result and their possible effect on the fatigue lifetime of these steels.

scholarly journals Experimental Study on Nano-SiO2 Improving Concrete Durability of Bridge Deck Pavement in Cold Regions

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Youkun Cheng ◽  
Zhenwu Shi
Keyword(s):  
Experimental Study ◽  
Abrasion Resistance ◽  
Calcium Silicate Hydrate ◽  
Bridge Deck ◽  
Hardened Cement ◽  
Concrete Durability ◽  
Ion Permeability ◽  
Cold Regions ◽  
Bridge Deck Pavement ◽  
Early Damage

In order to reduce early damage of bridge deck pavement concrete in cold regions, a certain content of nano-SiO2 is added into the concrete to enhance its durability. Through tests on four durability indexes, strength, frost resistance, resistance to Cl− ion permeability, and abrasion resistance of concrete with 1% nano-SiO2 content and concrete without nano-SiO2, the ability of nano-SiO2 to improve the concrete durability of bridge deck pavement is evaluated. The results of tests and analysis show that the incorporation of nano-SiO2 greatly improves the four durability indexes. Nano-SiO2 effectively absorbs the calcium hydroxide released early by the hydration of cement, increases the calcium silicate hydrate content, and elevates the interface between the paste and aggregate of the hardened cement, which improves the durability of the concrete.

Experimental Study of Tungsten Inert Gas Pulsed Welding Applied to Ni-Ti Shape Memory Alloy Wires

2015 ◽  
Vol 1765 ◽  
pp. 153-158 ◽  
Author(s):  
Luiz F.A. Rodrigues ◽  
Fernando A. Amorim ◽  
Francisco F.R. Pereira ◽  
Carlos J. de Araújo
Keyword(s):  
Experimental Study ◽  
Shape Memory Alloy ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Welding Process ◽  
Functional Materials ◽  
Inert Gas ◽  
Scanning Calorimetry ◽  
Dissimilar Joints ◽  
Mechanical Cycling

ABSTRACTShape memory alloys are functional materials that can recover plastic strains between 2 and 6%. This property can be used to produce actuators for many areas as medicine, robotic, aeronautic and others. Recently, it has been observed the particular interest for shape memory alloys welding, especially to obtain Ni-Ti similar and dissimilar joints and fabricate simple or complex structures. In this sense, this work present an experimental study of tungsten inert gas pulsed welding applied to Ni-Ti shape memory alloy wires with 0.9 mm in diameter, previously heat treated at 450 °C for 20 minutes and air cooled. For that, it was carried out tensile tests at isothermal temperatures from 40 °C to 90 °C (steps of 10 °C) for welded and unwelded wires. The transformation temperatures obtained from differential scanning calorimetry were compared to verify the effect of welding process. It was also performed a stabilization process by mechanical cycling in some welded and unwelded Ni-Ti wires. The results showed a low strength and strain capacity of the weld joint at higher temperatures. Although, at lowest temperature, close to 40 °C, it was observed higher values of maximum stress and strain for welded Ni-Ti wires.

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