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• DOI: 10.1007/s40194-015-0288-2
• Corpus ID: 139022822

Qualitative and quantitative analyses of arc characteristics in SMAW

• M. Shigeta , T. Ikeda , +9 authors M. Ota
• Published in Welding in the World 21 January 2016
• Engineering, Materials Science

6 Citations

Analysis of the thermal characteristics of welding spatters in smaw using simplified model in fire technology, effects of welding time and electrical power on thermal characteristics of welding spatter for fire risk analysis, multifunctional arc-welding controller using sosmc technique, visualization of electromagnetic-thermal-fluid phenomena in arc welding, infrared thermal imaging of patients with acute upper respiratory tract infection: mixed methods analysis, infrared thermal imaging of patients with acute upper respiratory tract infection: mixed methods analysis (preprint), 11 references, methods for the determination of arc stability, a proposal to easily find out on arc stability of welding electrode, analysis of welding arc phenomenon with image processing, the science and practice of welding: city and guilds of london institute examination questions, increasing efficiency and qualifying of welding process by new welding materials., special issue advanced welding technology. approach to de-skillization through welding materials., quantitative estimates of arc stability for co2 gas shielded arc welding, related papers.

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Home > Graduate College > Student Work > Dissertations and Theses @ UNI > 926

Dissertations and Theses @ UNI

The effect of shielded metal arc welding process variables on delta ferrite control in austenitic stainless steel weld metal.

Ralph Eldon Long , University of Northern Iowa

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Open Access Dissertation

Shielded metal arc welding; Austenitic stainless steel--Welding;

This study was to determine the effects of shielded metal arc welding on delta ferrite in austenitic stainless steel weld metal. The two objectives of the study were to determine: (a) what variables of the SMAW process affect the delta ferrite content or Ferrite Number of austenitic stainless steel weld metal, and (b) to what extent the Ferrite Number is affected by SMAW variables.

The research design was experimental with data collected from mechanically produced weld metal using a magnetic instrument calibrated in Ferrite Numbers (FN). The electrode alloys tested were 308, 308L, 316L and 347. The sizes of electrodes used were 3/32, 1/8 and 5/32 inch. Variables tested were amperage, voltage, travel speed, cooling rate, travel angle, work angle, coupon size and static output characteristics of welding machines.

The data were analysed by correlation and regression analysis or by difference of means of the FN values of the control and experimental procedures. A visual evaluation of weld quality was made using criteria of a welding code. The data collected from visually acceptable welds was organized as a series of graphs. It was determined that amperage within a usable range did not cause rejectable FNs, voltage increases of a few volts did cause rejectable FNs, travel speed changes of four through nine inches per minute did not cause rejectable FNs, cooling rate changes studied did not cause rejectable FNs, travel angle changes of 40° forward to 20° reverse did not cause FN changes, work angle changes of 90° to 45° did not cause a significant change in FN, coupon size changes studied did not effect FN and the effect of different static output characteristics of a welding machine did have a significant effect on FN. All tests of significant differences were evaluated at the .05 level.

• Any increase in slag blanket depth over the molten metal caused some increase in FN.
• Welding machines with different static output characteristics may have different arc striking abilities and provide other benefits.
• Variables effecting only slight changes in FN may be accumulative and be a factor in an overall control program.
• The factor for calculating nitrogen content of weld metal was found for this group of welds to more nearly be 0.08 than the recommended 0.06 normally used.

Year of Submission

Degree name.

Doctor of Industrial Technology

Department of Industrial Technology

First Advisor

Alvin E. Rudisill

Date Original

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1 PDF file (x, 197 pages)

©1980 Ralph E. Long

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Long, Ralph Eldon, "The effect of shielded metal arc welding process variables on delta ferrite control in austenitic stainless steel weld metal" (1980). Dissertations and Theses @ UNI . 926. https://scholarworks.uni.edu/etd/926

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Qualitative and quantitative analyses of arc characteristics in SMAW

• Research Paper
• Published: 21 January 2016
• Volume 60 , pages 355–361, ( 2016 )

Cite this article

• Masaya Shigeta 1 ,
• Takahiro Ikeda 1 ,
• Manabu Tanaka 1 ,
• Tetsuo Suga 1 ,
• Bovornchok Poopat 2 ,
• Somporn Peansukmanee 2 ,
• Niwat Kunawong 2 ,
• Ackadech Lersvanichkool 3 ,
• Hiroaki Kawamoto 3 ,
• Supot Thongdee 3 ,
• Kazuyuki Suenaga 4 &
• Makoto Ota 4  

518 Accesses

4 Citations

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This study was conducted to develop a quantitative evaluation system for arc characteristics such as arc stability and welding spatter generation related to shielded metal arc welding (SMAW) without human sensory evaluation. Factors that correspond to sensory evaluations by welders were investigated based on image processing. For the quantitative evaluation of arc stability, results show that the root mean square and the standard deviation of the arc center fluctuation, respectively, correspond to welders’ sensory evaluation at AC and DC discharges. For welding spatter generation, a method of counting white pixels in a binarized image evaluates the number and size of welding spatters which closely coincide with welders’ sensory evaluations.

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Author information

Authors and affiliations.

Joining and Welding Research Institute, Osaka University, Ibaraki, Japan

Masaya Shigeta, Takahiro Ikeda, Manabu Tanaka & Tetsuo Suga

King Mongkut’s University of Technology Thonburi, Bangkok, Thailand

Bovornchok Poopat, Somporn Peansukmanee & Niwat Kunawong

Thai-Kobe Welding Co. Ltd., Samut Prakan, Thailand

Ackadech Lersvanichkool, Hiroaki Kawamoto & Supot Thongdee

Welding Process Department, Kobe Steel, Ltd., Fujisawa, Japan

Kazuyuki Suenaga & Makoto Ota

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Correspondence to Masaya Shigeta .

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Recommended for publication by Study Group 212 - The Physics of Welding

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Shigeta, M., Ikeda, T., Tanaka, M. et al. Qualitative and quantitative analyses of arc characteristics in SMAW. Weld World 60 , 355–361 (2016). https://doi.org/10.1007/s40194-015-0288-2

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Received : 09 May 2015

Accepted : 22 December 2015

Published : 21 January 2016

Issue Date : March 2016

DOI : https://doi.org/10.1007/s40194-015-0288-2

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Smawomen: the Lived Experiences of Female SMAW Students in Selected Schools in Calamba West District S.Y.2018-2019

• Beverly Fernandez

INTRODUCTION

One of the most pressing concerns about today's issues is the prejudice among students who belong to non-academic track, especially for those female students, which could be discouraging and disturbing in their studies. Nevertheless, we aim to know the reasons why female SMAW students chose the SMAW strand, whilst in our generation discrimination is prevalent, considering SMAW as a strand for men only. We also aim to know what the benefits in would beentering a SMAW strand, if they really get benefits fromthis or none at all. In this study, we delved into the lived experiences, including the difficulties and opportunities, of the female SMAW students in selected schools in West District, Calamba City SY: 2018-2019.

We used the phenomenological approach in order to portray the lived experiences of the respondents, to know how they cope up each day in SMAW strand, to know the major factors that affect them in choosing this strand, and to analyze and understand women in SMAW strand through personal interviews. We used a purposive non-random sampling in choosing their respondents. Seven (7) female SMAW students responded to a set of self-administered questions. The instrument we made is composed of five general questions and a few specific questions that are all open-ended.

Throughout the study, we found out that female SMAW students are influenced positively and negatively by their male classmates but they are most likely to adapt skills from their male classmates. Along with this, we established the following themes: (1) factors affecting female SMAW students in choosing SMAW, (2) gender equality in a male-dominated class, (3) socialization means, (4) difficulties and challenges, (5) future plans after graduation. The respondents voiced out some socialization experience, health difficulties and lack of financial support. When it comes to behaviors and perceptions, female SMAW students experienced defective socialization and stated that they are being underestimated for the strand they took.

DISCUSSIONS

The results depicted that school may promote strand equality among students in all strand that it offers and may support all students in addressing their needs. Thus, we sought to examine the lived experiences of female SMAW students in selected schools in Calamba West District, which relate to building social and human capital as the key element in empowering women on the road to development.

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The effects of arc welding hazards to welders and people surrounding the welding area

• Dar es Salaam Institute of Technology

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