scholarly journals PERANCANGAN MEJA PUTAR ROLL WELDING SEBAGAI ALAT BANTU PENGELASAN (STUDI KASUS : ART WELDING PT. MECO INOXPRIMA)

2019 ◽  
Vol 20 (1) ◽  
pp. 57
Author(s):  
Imam kholiq Imam Imam
Keyword(s):  
Welding Process ◽  
Zero Point ◽  
Setup Time ◽  
Travel Speed ◽  
Production Costs ◽  
Production Volume ◽  
Rotary Table ◽  
Starting Point ◽  
Welding Defects ◽  
Design And Manufacture

Welding that produces a quality connection and is very possible to connect metal by welding in various shapes and positions. Therefore the welding process must require a practical material supporting device and in accordance with the needs of all welding positions which will facilitate and provide welder comfort in welding. So that the results of maximum and quality welds (good hasis las visually) are produced in this study the type of connection used is angular joints with the aim of designing and making tools to get the results of welding joints and comparing the distortions that occur between using desk tools rotate and without using tools. In this study Gtaw welding was used with the brand DC ARC WELDER with type Bz-300F-3 and filler type ER 308L, Voltage 20-30 V, travel speed 60 mm / min and variations of Flow (A) namely 100 A, 125 A and 150 A. with a diameter of 2.4 mm as a filler. The study was limited to the design and manufacture of tools and measurements of distortion carried out 20 times. Distortion measurement uses a dial indicator with a starting point / zero point on the end of the test object and the end point in the weld joint area. The results show that the use of roll welding tools can reduce the occurrence of distortion. The smallest value of distortion is obtained using a roll welding rotary table tool which is equal to 0.33 degrees, while the smallest value of distortion without using roll welding is 1.33 degrees. And the use of roll welding rotary table aids can reduce welding defects reduce setup time and can increase production volume which results in a decrease in production costs, making it quite feasible and efficient in terms of the economy.

Design and manufacture of automatic plastic valve welding machine

2021 ◽  
pp. 095440892098821
Author(s):  
Özgür Özdilli
Keyword(s):  
Welding Process ◽  
Production Costs ◽  
Automation System ◽  
Total Production ◽  
Welding Machine ◽  
Integrated Automation System ◽  
Speed Up ◽  
Traditional Manufacturing ◽  
Design And Manufacture ◽  
Plastic Welding

Plastic welding method is a widely used technology for the welding of pressure and vacuum bags using plastic valves. Conducting this process with traditional methods creates disadvantages in terms of production speed, product quality and economical aspects. Today, assembly costs make up the majority of total production costs, manufacturers pay more attention to assembly automation and work in this direction in order to reduce costs, speed up the production process and increase efficiency. In this study, it is aimed to design and manufacture a single Automatic Valve Welding Machine that can do all of these operations and integrated automation system instead of cutting, punching and plastic welding process that can be performed with multiple machines and workers. In this context, a new automated machine was designed in 3 D, and engineering analyzes were carried out to manufacture a prototype. In design, the machine has been made suitable for developing technology by using PLC (Programming Logic Controller) and pneumatic system. In addition, static analyzes of the machine were made. With the inclusion of a production-specific automatic controlled plastic welding machine, manufacturing can be done faster, with higher quality, lower costs and less wastage compared to the traditional manufacturing process.

MINIMALISASI BIAYA SIMPAN DAN BIAYA SETUP PADA MULTIPLE PRODUK: SIMULASI DENGAN CAPACITATED LOT SIZING PROBLEM

2019 ◽  
Vol 4 (2) ◽  
pp. 205-214
Author(s):  
Erika Fatma
Keyword(s):  
Production Cost ◽  
Lot Sizing ◽  
Setup Time ◽  
Production Costs ◽  
Total Production ◽  
Product Cycle ◽  
Lot Size ◽  
Setup Costs ◽  
Lot Sizing Problem ◽  
Capacitated Lot Sizing

Lot sizing problem in production planning aims to optimize production costs (processing, setup and holding cost) by fulfilling demand and resources capacity costraint. The Capacitated Lot sizing Problem (CLSP) model aims to balance the setup costs and inventory costs to obtain optimal total costs. The object of this study was a plastic component manufacturing company. This study use CLSP model, considering process costs, holding costs and setup costs, by calculating product cycle and setup time. The constraint of this model is the production time capacity and the storage capacity of the finished product. CLSP can reduce the total production cost by 4.05% and can reduce setup time by 46.75%.  Keyword: Lot size, CLSP, Total production cost.

scholarly journals Conventional and Alternative Sources of Thermal Energy in the Production of Cement—An Impact on CO2 Emission

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1539
Author(s):  
Karolina Wojtacha-Rychter ◽  
Piotr Kucharski ◽  
Adam Smolinski
Keyword(s):  
Co2 Emissions ◽  
Co2 Emission ◽  
Alternative Fuels ◽  
Carbon Dioxide Emission ◽  
Calorific Value ◽  
Production Costs ◽  
Partial Substitution ◽  
Research Activities ◽  
Starting Point ◽  
Clinker Production

The article evaluates the reduction of carbon dioxide emission due to the partial substitution of coal with alternative fuels in clinker manufacture. For this purpose, the calculations were performed for seventy waste-derived samples of alternative fuels with variable calorific value and variable share in the fuel mixture. Based on annual clinker production data of the Polish Cement Association and the laboratory analysis of fuels, it was estimated that the direct net CO2 emissions from fossil fuel combustion alone were 543 Mg of CO2 per hour. By contrast with the full substitution of coal with alternative fuels (including 30% of biomass), the emission ranged from 302 up to 438 Mg of CO2 per hour, depending on fuel properties. A reduction of 70% in the share of fossil fuels resulted in about a 23% decrease in net emissions. It was proved that the increased use of alternative fuels as an additive to the fuel mix is also of economic importance. It was determined that thanks to the combustion of 70% of alternative fuels of calorific value from 15 to 26 MJ/kg, the hourly financial profit gain due to avoided CO2 emission and saved 136 megatons of coal totaled an average of 9718 euros. The results confirmed that the co-incineration of waste in cement kilns can be an effective, long-term way to mitigate carbon emissions and to lower clinker production costs. This paper may constitute a starting point for future research activities and specific case studies in terms of reducing CO2 emissions.

Features of structure formation processes in AA2024 alloy joints formed by the friction stir welding with bobbin tool

2021 ◽  
Vol 23 (2) ◽  
pp. 98-115
Author(s):  
Alexey Ivanov ◽  
◽  
Valery Rubtsov ◽  
Andrey Chumaevskii ◽  
Kseniya Osipovich ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Structure Formation ◽  
Welded Joints ◽  
Heat Input ◽  
Welded Joint ◽  
Welding Process ◽  
Tool Material ◽  
Travel Speed ◽  
Material System ◽  
Friction Stir

Introduction. One of friction stir welding types is the bobbin friction stir welding (BFSW) process, which allows to obtain welded joints in various configurations without using a substrate and axial embedding force, as well as to reduce heat loss and temperature gradient across the welded material thickness. This makes the BFSW process effective for welding aluminum alloys, which properties are determined by their structural-phase state. According to research data, the temperature and strain rate of the welded material have some value intervals in which strong defect-free joints are formed. At the same time, much less attention has been paid to the mechanisms of structure formation in the BFSW process. Therefore, to solve the problem of obtaining defect-free and strong welded joints by BFSW, an extended understanding of the basic mechanisms of structure formation in the welding process is required. The aim of this work is to research the mechanisms of structure formation in welded joint of AA2024 alloy obtained by bobbin tool friction stir welding with variation of the welding speed. Results and discussion. Weld formation conditions during BFSW process are determined by heat input into a welded material, its fragmentation and plastic flow around the welding tool, which depend on the ratio of tool rotation speed and tool travel speed. Mechanisms of joint formation are based on a combination of equally important processes of adhesive interaction in “tool-material” system and extrusion of metal into the region behind the welding tool. Combined with heat dissipation conditions and the configuration of the “tool-material” system, this leads to material extrusion from a welded joint and its decompaction. This results in formation of extended defects. Increasing in tool travel speed reduce the specific heat input, but in case of extended joints welding an amount of heat released in joint increases because of specific heat removal conditions. As a result, the conditions of adhesion interaction and extrusion processes change, which leads either to the growth of existing defects or to the formation of new ones. Taking into account the complexity of mechanisms of structure formation in joint obtained by BFSW, an obtaining of defect-free joints implies a necessary usage of various nondestructive testing methods in combination with an adaptive control of technological parameters directly in course of a welding process.

scholarly journals An Economic Analysis of The Costs of Producing Tomato Under Greenhouse in Anbar Governorate For the Agricultural Season 2019-2020

2021 ◽  
Vol 904 (1) ◽  
pp. 012061
Author(s):  
I A Mohammed ◽  
M A K Al Dulaimi
Keyword(s):  
Agricultural Sector ◽  
Great Difficulty ◽  
Production Costs ◽  
Coefficient Of Determination ◽  
Optimal Size ◽  
Production Volume ◽  
Fixed Costs ◽  
Average Production ◽  
Local Product

Abstract The research aims to analyze the costs of producing tomato under greenhouses in Anbar Governorate for the agricultural season (2019-2020), based on field data of 16 samples selected randomly. The results of the analysis shows that fixed costs constitute about (44.20%), while variable costs constitute about (55.80%) of the total costs. The average production costs in the research sample are about (109808) dinars/ton. The long-term cubic function was the best among the functions that express the relationship between production costs as a dependent variable and production and the number of greenhouses on the farm as independent variables. This is due to its analogy with the logic of economic theory. The modified coefficient of determination in it R-2 reached (0.98). It is found that the optimal size of the farm includes (3) greenhouses. It achieves the optimum production volume of (21.17) tons/farm. The average cost is about (64193) dinars/ton. (62.5%) of the farmers in the study sample achieve capacity savings, while (31.25%) do not achieve any savings. As for the percentage of farmers who achieve low rates of economic efficiency, they reach about (6.25%). The supply function shows that the elasticity of supply decreases with the increase in production. This means that the farmer faces great difficulty in controlling production in the event of price changes. The study recommended the needed to raise the marketing efficiency of the products of the agricultural sector and to protect the local product to help the Iraqi farmer attain the ability to compete.

The Effect of Sub-Zero Treatment on Mechanical Properties of GTAW Welded AA6082

2016 ◽  
Vol 852 ◽  
pp. 349-354 ◽  
Author(s):  
R. Devanathan ◽  
Sanjivi Arul ◽  
T. Venkatamuni ◽  
D. Yuvarajan ◽  
D. Christopher Selvam
Keyword(s):  
Mechanical Properties ◽  
Arc Welding ◽  
Artificial Aging ◽  
Cryogenic Treatment ◽  
Welding Process ◽  
Travel Speed ◽  
Treatment Result ◽  
Gas Tungsten Arc ◽  
Shallow Cryogenic Treatment ◽  
Hardness Values

The consequence of sub-zero treatment on the mechanical properties of welded AA6082-T6 by Gas Tungsten Arc Welding (GTAW) which in turn softens the heat concentrated welded region owing to dissolution of the strengthening precipitates. The sub-zero i.e. Shallow Cryogenic Treatment (SCT) is carried out on GTAW welded plate having a thickness of 6 mm at -77°C by varying the electrode travel speed and sub-zero treatment periods. Welded region of AA6082 were tested for hardness and microstructure by adapting three different conditions such as welded, post weld artificial aging with and without sub-zero treatment. Result revealed that the amount of softening in the welded region is indirectly proportional to electrode travel speed during welding process. It is also observed that the post weld SCT with artificial aging has increased the micro hardness values on the welded region as a consequence of the reactivation in the sequence of precipitation.

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.

The zero point survey and egg-timer model combined for crew management

2020 ◽  
Vol 12 (11) ◽  
pp. 430-435
Author(s):  
Tom Mallinson ◽  
Sam Willis
Keyword(s):  
High Stress ◽  
Zero Point ◽  
Practical Application ◽  
Management Skills ◽  
Complex Scene ◽  
Crew Management ◽  
Starting Point ◽  
Good Starting Point ◽  
Personal Performance ◽  
Improve Patient

Managing a complex scene and a critically unwell patient at the same time is a challenge for any paramedic, in terms of both personal preparation and crew resource management. While modern paramedicine requires new solutions to situated challenges, a good starting point is to review existing frameworks to seek ways of maximising the safety of the care delivered by paramedics. This paper provides a synthesis of the theoretical egg-timer model of disparity combined with a practical framework called the zero point survey as cohesive tools for operational paramedics to optimise their performance while experiencing high-stress situations. This synthesis provides a valuable aide mémoire for strategies to improve personal performance, leadership and teamworking in relation to the care of a critically unwell patient. Such models fit within current practice, and have the potential to lead to safer paramedic care through the practical application of human factors theory, with team management skills and psychological interventions to improve patient outcomes.

scholarly journals Effects of Different Roller Profiles on the Microstructure and Peel Strength of the Ultrasonic Welding Joints of Nonwoven Fabrics

2020 ◽  
Vol 10 (12) ◽  
pp. 4101
Author(s):  
Thanh-hai Nguyen ◽  
Le Quang Thanh ◽  
Nguyen Huu Loc ◽  
Manh Ngo Huu ◽  
Anh Nguyen Van
Keyword(s):  
Manufacturing Industry ◽  
Welding Process ◽  
Peel Strength ◽  
Ultrasonic Welding ◽  
Water Repellent ◽  
Nonwoven Fabrics ◽  
Melted Zone ◽  
Welding Defects ◽  
Resilient Functions ◽  
Welding Joints

Nonwoven fabrics are widely used in the textile manufacturing industry due to their advanced characteristics, such as their soft, water-repellent, recycle, ecological, and resilient functions. Nowadays, one of the innovated technologies applied to bond nonwoven fabrics is the ultrasonic welding method, due to the advantages afforded by its clean, fast, and reliable approach. In this work, isotactic polypropylene (PP) nonwoven fabrics were bonded by a continuous ultrasonic welding process. In order to consider the influence of the roller on the formation of welding joints and their mechanical properties, different roller profiles were designed, fabricated, and tested. Eight types of roller profiles corresponding to No. 1–No. 8 in the experiments were divided into four groups. After bonding, the microstructure in a typical case (i.e., No. 1) was captured by scanning electron microscopy (SEM) to examine the formation of the welding joints. Additionally, the load and the peel strength of the welding joints of all eight roller profiles were analyzed. The results showed that no welding defects, such as cracks or blowholes, were visible in the melted zone. The load depended on the area ratio(s) of the welding area (S0) to the cycling area (S1). Furthermore, it was found out that the peel strength of the welding joints with brick structures were higher than the peel strength in the case of solid line structures.

Enhancing fatigue resistance of activated tungsten inert gas welded UNS S32750 super duplex stainless steel by optimizing its technological properties

2020 ◽  
pp. 1-11
Author(s):  
A. Arunmani ◽  
T. Senthilkumar
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
Duplex Stainless Steel ◽  
Fatigue Resistance ◽  
Process Parameters ◽  
Gas Flow ◽  
Welding Process ◽  
Travel Speed ◽  
Inert Gas ◽  
Super Duplex Stainless Steel

In engineering industries and heavy manufacturing plants, fatigue life of joints plays a pivotal role in determining the overall life span of the welded joint. In this paper, an advanced fusion joining technique, namely activated tungsten inert gas welding, was used for joining UNS S32750 super duplex stainless steel, with ZnO as activation flux. For the enhancement of fatigue resistance of joints, important welding process parameters were fluctuated according to a developed central composite design model. Empirical relationships were developed between the process parameters and the fatigue strength of the joints, which was correlated with the number of cycles to failure (NCF). Using analysis of variance, the significance of the developed fatigue model was ascertained. Using response surface methodology, optimization of process parameters for enhancement of fatigue resistance was done. It was observed that at the optimized activated tungsten inert gas weld process parameters of travel speed of welding torch at 69.85 mm/min, weld current at 125.20 A, and shielding gas flow rate at 14.77 L/min, a high fatigue life of 7.66396 × 108 NCF was obtained and the model was validated to very high predictability. Microstructural variations in the fatigue-tested specimens were evaluated for identifying the grain modifications.

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