scholarly journals Pengaruh Kuat Arus Dan Besar Sudut Kampuh Terhadap Kekuatan Impact Dan Nilai Kekerasan Plat Baja Karbon Rendah Dengan Menggunakan Las SMAW

2020 ◽  
Vol 3 (2) ◽  
pp. 53
Author(s):  
Soleh Abdul Aziz
Keyword(s):  
Impact Strength ◽  
Experimental Method ◽  
Welding Current ◽  
Electric Arcs ◽  
Welding Seam ◽  
The Impact

Abstract: Welding is welding that utilizes flame heat in electric arcs to melt electrodes and workpieces. SMAW welding is widely used because of its relatively easy to use, cost-friendly and maximum quality results. In conducting welding has several factors that will affect the quality of the welding results such as a welder, welding current and metal distance and welding seam angle. This study aims to determine whether there is an influence of current variations and magnitude of the seam angle to the value of the impact strength and the hardness value of the SMAW welding results. This study uses a pre-experimental method with a one-shot case model. The results of this study indicate the highest impact strength values of current variations in the 80 Ampere specimen at the angle of seam V 60o in the amount of 0.0799 J / mm2 and in the 80 Ampere specimen in the angle of the 80o V in the seam angle of 0.0942 J / mm2. Then for the highest impact strength value variation of seam angle V group of seam angle specimen V 80o current 80 Amperes is equal to 0.0942 J / mm2 and specimen angle of seam V 80o current 100 Ampere 0.0824 J / mm2. The highest hardness value is obtained with a variation of the current specimen group of 100 Ampere in the angle of seam V 60o that is equal to 187.1 HVN and in the specimen group 100 Ampere with the angle of contact V 80o that is equal to 204.4 HVN. Then the highest hardness value variation angle seam V specimen V 80o with current 80 Amperes is equal to 191.63 HVN and specimen angle of seam V 80o with 100 amperes current that is equal to 204.4 HVN. KeyWords : SMAW, Welding current, V groove, Impact Strength, Hardness

Investigations on Seam Quality in Laser Beam Welding of Contaminated, Zinc Coated Sheets

2005 ◽  
Vol 6-8 ◽  
pp. 187-194 ◽  
Author(s):  
A. Blankl ◽  
Manfred Geiger
Keyword(s):  
Laser Beam ◽  
Laser Beam Welding ◽  
Zinc Coating ◽  
Cost Savings ◽  
Production Costs ◽  
High Porosity ◽  
Welding Seam ◽  
Welding Operation ◽  
The Impact

The customers’ demand for high quality and low cost products with rising functionality forces the enterprises to cost savings. In production these cost savings can be accomplished by simplification or omission of handling operations in the process chain. In laser beam welding of stamped sheet metals a previous cleaning of the sheets is usually necessary to guarantee a sufficient seam quality at a lap joint. Due to the recent trend towards low use of lubricants in forming operations the question arises, whether this process could be avoided in order to lower the production costs. The disadvantage of this measure would be a degradation of the seam quality. This reduction shows up in a falling strength of the weld due to inclusions and pore formation. This paper deals with the impact of different types of contaminations on the quality of laser welding. Therefore several liquid (oils) and solid (metallic and non-metallic) contaminants are examined. Zinc coated sheets are investigated too, because a zinc contamination arises with these sheets in the welding operation. The zinc coating evaporates because of the high temperature and this leads to a high porosity in the welding seam. In both cases also the height of the gap between the two sheets is varied in order to investigate its influence on the weld. To reduce the effort of the investigations, but not the accuracy of the results, the laboratory trials were supported by the methods of design of experiments. After the welding operation, the quality of the welding seam is evaluated by means of its mechanical properties and tightness. The results of the investigations are discussed and the developed solution strategies are presented.

scholarly journals ANALISA KEKUATAN IMPACT DAN MODEL PATAHAN KOMPOSIT POLYESTER-SERAT ECENG GONDOK DI TINJAU DARI TIPE PENYUSUNAN SERAT

2018 ◽  
Vol 6 (1) ◽  
pp. 58
Author(s):  
Dodik Aprilia ◽  
I Nyoman Pasek Nugraha ◽  
Kadek Rihendra Dantes
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Experimental Method ◽  
Fiber Orientation ◽  
Water Hyacinth ◽  
Composite Fiber ◽  
Continuous Fiber ◽  
Polyester Composite ◽  
Independent Variable ◽  
The Impact

Penelitian ini dilakukan untuk mengetahui orientasi serat yang terbaik yang dapat digunakan sebagai komposit matrik polyester berpenguat serat eceng gondok. Sifat mekanik yang dimaksud adalah kekuatan impact dan foto patahan mikro permukaan dan standar ukuran specimen sesuai ASTM D6110-4. Penelitian ini merupakan penelitian metode eksperimen dengan variabel terikat kekuatan impak, dan variabel bebas yaitu orientasi serat continuous, discontinuous, dan hybride.selanjutnya akan dianalisis menggunakan anava Dari penelitian yang dilakukan diketahui bahwa nilai impact tertinggi ada pada orientasi serat hybride yaitu 2.441,25 J/m3 , sedangkan kekuatan impact terendah pada orientasi serat continous yaitu 1.085,002 J/m3. Berdasarkan dari uji Scheffe yang sudah didapat, bahwa terdapat perbedaan kekuatan impak komposit polyester berpenguat serat alam eceng gondok antara orientasi serat continuous dengan discontinuous dengan nilai 12,86 orientasi serat continuous dengan hybride dengan nilai 24,03 dan orientasi serat discontinuous dengan hybride dengan nilai 11,02 .Kata Kunci : Kata kunci :orientasi serat, impak, model patahan.komposit,polyester This research was conducted to find out the best fiber orientation that can be used as a fiber-reinforced polyester composite of water hyacinth. The mechanical properties in question are the impact strength and photo surface micro-fracture and standard sized specimens according to ASTM D6110-04. This research is a research of experimental method with dependent variable of impact strength, and independent variable that is continuous fiber orientation, discontinuous, and hybride. Then will be analyzed using anava From the research, it is known that the highest impact is on the orientation of the fiber hybride is 2,441,25 J / m3, while the lowest impact strength on continuous fiber orientation is 1,085,002 J / m3.Based on the further test Scheffe has been obtained, that there is a difference of impact strength of polyester composite fiber-made natural hyacinth between continuous fiber orientation with discontinuous with value 12,86 continuous fiber orientation with hybride with value 24,03 and orientation fiber discontinuous with hybride with value 11,0.keyword : Keywords: fiber orientation, impact, fracture model.composite, polyester

scholarly journals Characterisation of Used PP-Based Car Bumpers and Their Recycling Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
M. P. Luda ◽  
V. Brunella ◽  
D. Guaratto
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Impact Resistance ◽  
Dynamic Mechanical Properties ◽  
Speed Test ◽  
The Matrix ◽  
Internal Mixer ◽  
Mineral Fillers ◽  
The Impact

Three used PP-based car bumpers are characterized by many techniques (fractionation, IR, TGA, DSC, DMTA, and SEM). They show different impact and static and dynamic mechanical properties depending on their composition and morphology. It appears that block copolymer compatibilizers constituted by polyethylene-polypropylene sequences allow a better compatibility between the rubber domains and the PP matrix leading to relatively high impact resistance. Indeed if the ethylene sequences of the copolymer are large enough to crystallize, the decreased mobility of the whole system impairs the impact resistance. In addition, a higher amount of rubber in domains regular in shape and of greater dimension (1–3 μm) promotes a more homogeneous dispersion of external force inside the material, decreasing the risk of fracture. The amount of mineral fillers regulates the elastic modulus (the higher the load, the higher the modulus); however, a fairly good interfacial adhesion is required for satisfactory impact strength. All PP-based bumpers have been mechanically recycled in an internal mixer to redistribute oxidized species and to reestablish phase compatibilization. Recycling improves mechanical properties in slow speed test but fails to increase impact strength particularly in filled bumper, in which the quality of the matrix/filler interphase is hard to improve by simple remixing.

scholarly journals STUDI KOMPARASI PENGARUH VARIASI ARUS PENGELASAN TERHADAP KEKUATAN IMPAK, KEKERASAN, DAN STRUKTUR MIKRO SAMBUNGAN LAS PEGAS DAUN BAJA SUP 9 PADA PROSES LAS SMAW

2017 ◽  
Vol 9 (2) ◽  
pp. 57
Author(s):  
Fajar Nugroho
Keyword(s):  
Grain Size ◽  
Impact Strength ◽  
Welding Current ◽  
Hardness Test ◽  
Strength Test ◽  
Leaf Spring ◽  
Micro Structure ◽  
Current Impact ◽  
The Impact ◽  
To Receive

Abstract Spring is a component that functions to receive dynamic load and providescomfort in driving. The problem is the leaf spring is sometimes broken due to theoverload or unfavorable road conditions. The solution for that problem is grafting using the SMAW welding.This study aims to determine the effect of variations in the welding currentto the impact strength, hardness and microstructure. Types of weld used is SMAW with a variety of welding current of 100 A, 120 A and 140 A and the type of seam used is the type of seam V.The highest impact strength test was 1.698 j/mm2at 100 A and the highest hardness test was 355.338 HVN at 140 A. In addition, the micro structure at the welding area has bigger grain size and more pearlite structure at 140 A. Keywords: welding current, impact strength, hardness, micro structure AbstrakPegas adalah suatu komponen yang berfungsi untuk menerima beban dinamis dan memberikan kenyamanan dalam berkendara. Permasalahan yang sering dialami oleh pegas daun adalah patah akibat beban lebih atau kondisi jalan yang kurang baik. Penanganan pada hal seperti ini adalah penyambungan menggunakan las SMAW.Penelitian ini bertujuan untuk mengetahui pengaruh variasi arus pengelasan terhadap kekuatan impak, kekerasan dan Struktur mikro. Jenis las yang digunakan adalah las SMAW. Variasi arus pengelasan yang digunakanadalah 100 A, 120 A dan 140 A. Jenis kampuh yang digunakan adalah jenis kampuh V.Hasil uji kekuatan impak tertinggi diperoleh pada variasi arus 100 A yaitu sebesar 1,698 J/mm2. Hasil uji kekerasan tertinggi diperoleh pada variasi arus 140 A yaitu sebesar 355,338 HVN. Struktur mikro pada daerah las memiliki ukuran butiran yang semakin besar dan struktur perlit yang semakin banyak untuk variasi arus 140 A.Kata kunci: arus pengelasan, kekuatan impak, kekerasan, struktur mikro

scholarly journals Steel 09G2S laser bonding on flux layer

2017 ◽  
Vol 2 (10) ◽  
pp. 28-32
Author(s):  
Игорь Шиганов ◽  
Igor Shiganov ◽  
Евгений Шамов ◽  
Evgeny Shamov ◽  
Илья Бегунов ◽  
...  
Keyword(s):  
Arc Welding ◽  
Mechanical Tests ◽  
Welding Seam ◽  
Measurement Results ◽  
Laser Bonding ◽  
Welding Joints ◽  
Flux Layer ◽  
The Impact ◽  
Metal Hardness

A method of laser bonding aimed for the elimination of welding seam form defects is offered. The results of experiments confirming the impact of laser bonding on a flux layer upon the formation of a structure and quality of a welding seam are stated. The measurement results of metal hardness in welding joints obtained by an offered method and also by arc welding and laser bonding are shown. The results of the mechanical tests of welds obtained by laser bonding on a flux layer are pre-sented.

scholarly journals Contribution of laboratory-experimental method to the quality of students knowledge

Norma ◽  
2020 ◽  
Vol 25 (1) ◽  
pp. 53-64
Author(s):  
Mirjana Maričić ◽  
Stanko Cvjetićanin ◽  
Nataša Petojević ◽  
Branko Anđić
Keyword(s):  
Experimental Method ◽  
Science Teaching ◽  
Natural Science ◽  
Research Papers ◽  
Integrated Science ◽  
Cognitive Levels ◽  
Student Experiments ◽  
Methods Of Learning ◽  
The Impact

The aim of the paper is to analyze the contribution of the laboratory-experimental method (LEM) to the quality of students' knowledge of natural and inaccessible research. Papers were also selected to examine the comparative contribution to the quality of students' knowledge: LEM and other learning methods, that is, between student and demonstration experiments. Most of the research so far is focused on subject teaching and they are still rare in integrated science teaching. The research confirms the greater contribution of LEM than the traditional and other methods of learning about quality and durability of students' knowledge. Student experiments in most research contribute to the quality of students' knowledge more than the demonstration experiments. There is insufficient research which examines the impact of LEM on students' quality of knowledge at cognitive levels. In the teaching of most of the contents of natural science, priority should be given to the LEM method or it should be combined with other methods of learning.

scholarly journals Impact of the Dimensions of Diversity on the Quality of Nursing Care: The Case of Slovenia

2017 ◽  
Vol 5 (3) ◽  
pp. 383-390
Author(s):  
Jasmina Starc ◽  
Karmen Erjavec
Keyword(s):  
Experimental Method ◽  
Nursing Care ◽  
Research Study ◽  
Clinical Environment ◽  
Arithmetic Means ◽  
Within Subjects ◽  
Bonferroni Test ◽  
The Impact ◽  
Quality Of Nursing

BACKGROUND: The key to diversity in nursing is that nurses can provide competent nursing care to patients, within the scope of their responsibilities, regardless of the patients’ personalities or primary and secondary factors.AIM: To research which dimensions of diversity influence the attitude of nurses towards patients and the quality of nursing care.MATERIALS AND METHODS: This research study is based on the descriptive and causal non-experimental method of empirical research. The independent samples t-test was used, and the within subjects ANOVA with the Bonferroni posthoc test.RESULTS: There are statistically significant differences among the dimensions of diversity in the arithmetic means of the ratings of the impact on the quality of nursing (F (1.407, 579.658) = 103.307, p < 0.001). Based on the Bonferroni test, the impact of the “personality” dimension was rated statistically significantly higher than the impact of the dimensions of “primary factors” (p < 0.001) and “secondary factors” (p < 0.001).CONCLUSION: The diversity factors should be taken into account when developing knowledge of nurses for managing patients' diversity. In modern nursing care, the safe clinical environment needs to enable the patient to feel safe and dignified.

Effect of Welding Consumables on Dissimilar AISI304/AISI1015 Steels Butt Joint Properties

2018 ◽  
Vol 777 ◽  
pp. 344-349
Author(s):  
Surat Triwanapong ◽  
Kittipong Kimapong
Keyword(s):  
Impact Strength ◽  
Weld Metal ◽  
Welding Current ◽  
Interface Structure ◽  
Butt Joint ◽  
Shielded Metal Arc Welding ◽  
Metal Arc Welding ◽  
Joint Properties ◽  
Covered Electrodes ◽  
The Impact

The butt joint of dissimilar AISI304/AISI1015 steels was produced by a Shielded Metal Arc Welding (SMAW) with 3 types of the covered electrodes and the welding current of 80-120 A. The investigation of joint properties for the impact strength, the hardness, and the microstructure, was performed. The SMAW butt joint that was welded by the E312 covered electrode and 100A welding current showed the highest impact strength of 112 J. The chromium was the important reinforced element affected to increase in the hardness and the impact strength of the joint by forming and dispersing the chromium carbide in the weld metals. Interface structure of the carbon steel/the weld metal clearly showed a small combined area of the metals in opposition to the interface structure of the stainless steel/ the weld metal which had a large combined area of the metals.

Self-Compassion and Quality of Life in Adults Who Stutter

2020 ◽  
Vol 29 (4) ◽  
pp. 2097-2108
Author(s):  
Robyn L. Croft ◽  
Courtney T. Byrd
Keyword(s):  
Quality Of Life ◽  
Social Connectedness ◽  
The Self ◽  
Future Research ◽  
Self Compassion ◽  
Adults Who Stutter ◽  
And Gender ◽  
Relationship Of ◽  
The Impact

Purpose The purpose of this study was to identify levels of self-compassion in adults who do and do not stutter and to determine whether self-compassion predicts the impact of stuttering on quality of life in adults who stutter. Method Participants included 140 adults who do and do not stutter matched for age and gender. All participants completed the Self-Compassion Scale. Adults who stutter also completed the Overall Assessment of the Speaker's Experience of Stuttering. Data were analyzed for self-compassion differences between and within adults who do and do not stutter and to predict self-compassion on quality of life in adults who stutter. Results Adults who do and do not stutter exhibited no significant differences in total self-compassion, regardless of participant gender. A simple linear regression of the total self-compassion score and total Overall Assessment of the Speaker's Experience of Stuttering score showed a significant, negative linear relationship of self-compassion predicting the impact of stuttering on quality of life. Conclusions Data suggest that higher levels of self-kindness, mindfulness, and social connectedness (i.e., self-compassion) are related to reduced negative reactions to stuttering, an increased participation in daily communication situations, and an improved overall quality of life. Future research should replicate current findings and identify moderators of the self-compassion–quality of life relationship.

Surgery for Lung Cancer and the Consequences for the Swallow

2016 ◽  
Vol 1 (13) ◽  
pp. 162-168
Author(s):  
Pippa Hales ◽  
Corinne Mossey-Gaston
Keyword(s):  
Lung Cancer ◽  
Treatment Options ◽  
Vocal Cord Palsy ◽  
Subsequent Treatment ◽  
Physiological Reserve ◽  
Palliative Phase ◽  
And Function ◽  
The Impact ◽  
Swallow Function

Lung cancer is one of the most commonly diagnosed cancers across Northern America and Europe. Treatment options offered are dependent on the type of cancer, the location of the tumor, the staging, and the overall health of the person. When surgery for lung cancer is offered, difficulty swallowing is a potential complication that can have several influencing factors. Surgical interaction with the recurrent laryngeal nerve (RLN) can lead to unilateral vocal cord palsy, altering swallow function and safety. Understanding whether the RLN has been preserved, damaged, or sacrificed is integral to understanding the effect on the swallow and the subsequent treatment options available. There is also the risk of post-surgical reduction of physiological reserve, which can reduce the strength and function of the swallow in addition to any surgery specific complications. As lung cancer has a limited prognosis, the clinician must also factor in the palliative phase, as this can further increase the burden of an already compromised swallow. By understanding the surgery and the implications this may have for the swallow, there is the potential to reduce the impact of post-surgical complications and so improve quality of life (QOL) for people with lung cancer.

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