Friction stir welding of ductile iron and low carbon steel

Chin-Pao Cheng, H. M. Lin, J. C. Lin

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Friction stir welding (FSW) is a low distortion, high quality solid welding. There is no melting during the welding process, which results in improved welding quality. Ductile iron has the advantages of being low cost, of excellent castability, and of being good mechanically. Therefore, it is generally used in many structural engineering parts. In this study, ferritic ductile iron and low carbon steel were used to explore the qualities of dissimilar metal welding under different conditions. The FSW process, changes in the microstructure of the welding area and the mechanical properties of joints were explored. According to the research, we found that when dissimilar metal welding is conducted at 982 rev min-1 with a travelling speed of 72 mm min-1, flawless welding quality can be obtained if the stir rod rotates counterclockwise with carbon steel fixed in the advancing side and with ductile iron in the retreating side. FSW successfully provided defect free welds. However, fine pearlite and martensite structures appear in the stir zone, which result in mechanical property degradation of weldments. The stir zone in the weldments is very hard due to martensitic transformation. After heat treatment, the tensile strength improves, and the fracture site appears in the base metal of the carbon steel. However, the welding nugget is not completely filled when the stir rod directs ferritic ductile iron to the advancing side in the clockwise direction and carbon steel in the retreating side, which results in defects and lower welding quality.

Original languageEnglish
Pages (from-to)706-711
Number of pages6
JournalScience and Technology of Welding and Joining
Volume15
Issue number8
DOIs
Publication statusPublished - 2010 Nov 1

Fingerprint

friction stir welding
Friction stir welding
low carbon steels
Nodular iron
Low carbon steel
welding
Welding
iron
carbon steels
Carbon steel
Dissimilar metals
rods
structural engineering
mechanical properties
metals
pearlite
Mechanical properties
Defects
Pearlite
Martensitic transformations

Keywords

  • Carbon steel
  • Dissimilar metal welding
  • Ductile iron
  • Friction stir welding

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Friction stir welding of ductile iron and low carbon steel. / Cheng, Chin-Pao; Lin, H. M.; Lin, J. C.

In: Science and Technology of Welding and Joining, Vol. 15, No. 8, 01.11.2010, p. 706-711.

Research output: Contribution to journalArticle

@article{1930f700287347e4a2c5137e893251c2,
title = "Friction stir welding of ductile iron and low carbon steel",
abstract = "Friction stir welding (FSW) is a low distortion, high quality solid welding. There is no melting during the welding process, which results in improved welding quality. Ductile iron has the advantages of being low cost, of excellent castability, and of being good mechanically. Therefore, it is generally used in many structural engineering parts. In this study, ferritic ductile iron and low carbon steel were used to explore the qualities of dissimilar metal welding under different conditions. The FSW process, changes in the microstructure of the welding area and the mechanical properties of joints were explored. According to the research, we found that when dissimilar metal welding is conducted at 982 rev min-1 with a travelling speed of 72 mm min-1, flawless welding quality can be obtained if the stir rod rotates counterclockwise with carbon steel fixed in the advancing side and with ductile iron in the retreating side. FSW successfully provided defect free welds. However, fine pearlite and martensite structures appear in the stir zone, which result in mechanical property degradation of weldments. The stir zone in the weldments is very hard due to martensitic transformation. After heat treatment, the tensile strength improves, and the fracture site appears in the base metal of the carbon steel. However, the welding nugget is not completely filled when the stir rod directs ferritic ductile iron to the advancing side in the clockwise direction and carbon steel in the retreating side, which results in defects and lower welding quality.",
keywords = "Carbon steel, Dissimilar metal welding, Ductile iron, Friction stir welding",
author = "Chin-Pao Cheng and Lin, {H. M.} and Lin, {J. C.}",
year = "2010",
month = "11",
day = "1",
doi = "10.1179/136217110X12785889549507",
language = "English",
volume = "15",
pages = "706--711",
journal = "Science and Technology of Welding and Joining",
issn = "1362-1718",
publisher = "Maney Publishing",
number = "8",

}

TY - JOUR

T1 - Friction stir welding of ductile iron and low carbon steel

AU - Cheng, Chin-Pao

AU - Lin, H. M.

AU - Lin, J. C.

PY - 2010/11/1

Y1 - 2010/11/1

N2 - Friction stir welding (FSW) is a low distortion, high quality solid welding. There is no melting during the welding process, which results in improved welding quality. Ductile iron has the advantages of being low cost, of excellent castability, and of being good mechanically. Therefore, it is generally used in many structural engineering parts. In this study, ferritic ductile iron and low carbon steel were used to explore the qualities of dissimilar metal welding under different conditions. The FSW process, changes in the microstructure of the welding area and the mechanical properties of joints were explored. According to the research, we found that when dissimilar metal welding is conducted at 982 rev min-1 with a travelling speed of 72 mm min-1, flawless welding quality can be obtained if the stir rod rotates counterclockwise with carbon steel fixed in the advancing side and with ductile iron in the retreating side. FSW successfully provided defect free welds. However, fine pearlite and martensite structures appear in the stir zone, which result in mechanical property degradation of weldments. The stir zone in the weldments is very hard due to martensitic transformation. After heat treatment, the tensile strength improves, and the fracture site appears in the base metal of the carbon steel. However, the welding nugget is not completely filled when the stir rod directs ferritic ductile iron to the advancing side in the clockwise direction and carbon steel in the retreating side, which results in defects and lower welding quality.

AB - Friction stir welding (FSW) is a low distortion, high quality solid welding. There is no melting during the welding process, which results in improved welding quality. Ductile iron has the advantages of being low cost, of excellent castability, and of being good mechanically. Therefore, it is generally used in many structural engineering parts. In this study, ferritic ductile iron and low carbon steel were used to explore the qualities of dissimilar metal welding under different conditions. The FSW process, changes in the microstructure of the welding area and the mechanical properties of joints were explored. According to the research, we found that when dissimilar metal welding is conducted at 982 rev min-1 with a travelling speed of 72 mm min-1, flawless welding quality can be obtained if the stir rod rotates counterclockwise with carbon steel fixed in the advancing side and with ductile iron in the retreating side. FSW successfully provided defect free welds. However, fine pearlite and martensite structures appear in the stir zone, which result in mechanical property degradation of weldments. The stir zone in the weldments is very hard due to martensitic transformation. After heat treatment, the tensile strength improves, and the fracture site appears in the base metal of the carbon steel. However, the welding nugget is not completely filled when the stir rod directs ferritic ductile iron to the advancing side in the clockwise direction and carbon steel in the retreating side, which results in defects and lower welding quality.

KW - Carbon steel

KW - Dissimilar metal welding

KW - Ductile iron

KW - Friction stir welding

UR - http://www.scopus.com/inward/record.url?scp=78649555894&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78649555894&partnerID=8YFLogxK

U2 - 10.1179/136217110X12785889549507

DO - 10.1179/136217110X12785889549507

M3 - Article

VL - 15

SP - 706

EP - 711

JO - Science and Technology of Welding and Joining

JF - Science and Technology of Welding and Joining

SN - 1362-1718

IS - 8

ER -