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Hot cracking during welding and casting.

Cao, Guoping.

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Hot cracking during welding and casting.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Hot cracking during welding and casting./
Author:	Cao, Guoping.
Description:	209 p.
Notes:	Adviser: Sindo Kou.
Contained By:	Dissertation Abstracts International67-09B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3234868
ISBN:	9780542888489

Hot cracking during welding and casting.
Cao, Guoping.

Hot cracking during welding and casting. - 209 p.

Adviser: Sindo Kou.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2006.

Aluminum welds are susceptible to liquation cracking in the partially melted zone (PMZ). Using the multicomponent Scheil model, curves of temperature vs. fraction solid (T-fS) during solidification were calculated for the PMZ and weld metals (WMs). These curves were used to predict the crack susceptibility by checking if the harmful condition of WM fS > PMZ fS exists during PMZ solidification and reduce the susceptibility by minimizing this condition. This approach was tested against full-penetration welds of alloys 7075 and 2024 and it can be used to guide the selection or development of filler metals.

ISBN: 9780542888489Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Hot cracking during welding and casting.
LDR:03104nam 2200313 a 45 001 964262
005 20110901
008 110901s2006 eng d
020 $a 9780542888489
035 $a (UMI)AAI3234868
035 $a AAI3234868
040 $a UMI $c UMI
100 1 $a Cao, Guoping. $3 1287327
245 1 0 $a Hot cracking during welding and casting.
300 $a 209 p.
500 $a Adviser: Sindo Kou.
500 $a Source: Dissertation Abstracts International, Volume: 67-09, Section: B, page: 5335.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2006.
520 $a Aluminum welds are susceptible to liquation cracking in the partially melted zone (PMZ). Using the multicomponent Scheil model, curves of temperature vs. fraction solid (T-fS) during solidification were calculated for the PMZ and weld metals (WMs). These curves were used to predict the crack susceptibility by checking if the harmful condition of WM fS > PMZ fS exists during PMZ solidification and reduce the susceptibility by minimizing this condition. This approach was tested against full-penetration welds of alloys 7075 and 2024 and it can be used to guide the selection or development of filler metals.
520 $a Liquation cracking in the PMZ in welds of Al-Si cast alloys was also investigated. The crack susceptibility was evaluated by circular-patch test, and full-penetration welds made with filler metals 1100, 4043, 4047 and 5356. Liquation cracking was significant with filler metals 1100 and 5356 but slight with filler metals 4043 and 4047. In all welds, liquation cracks were completely backfilled, instead of open as in full-penetration welds of wrought alloys 2219 and 6061. The T-fS curves showed that alloy A357 has a much higher fraction liquid for backfilling before PMZ solidification was essentially over.
520 $a Hot tearing in Mg-xAl-yCa alloys was studied by constrained rod casting (CRC) in a steel mold. The hot tearing susceptibility decreased significantly with increasing Ca content (y) but did not change much with the Al content (x). An instrumented CRC with a steel mold was developed to detect the onset of hot tearing. The secondary phases, eutectic content, solidification path, and freezing range were examined.
520 $a Hot tearing in Mg-Al-Sr alloys was also studied by CRC in a steel mold. With Mg-(4,6,8)Al-1.5Sr alloys, the hot tearing susceptibility decreased significantly with increasing Al content. With Mg-(4,6,8)Al-3Sr alloys, the trend was similar but not as significant. At the same Al content, the hot tearing susceptibility decreased significantly with increasing Sr content. Instrumented CRC with a steel mold was also used to test hot tearing of Mg-Al-Sr alloys. Cracking occurred at a higher temperature in alloys most susceptible to cracking than in alloys least susceptible.
590 $a School code: 0262.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Metallurgy. $3 1023648
690 $a 0743
690 $a 0794
710 2 0 $a The University of Wisconsin - Madison. $3 626640
773 0 $t Dissertation Abstracts International $g 67-09B.
790 $a 0262
790 1 0 $a Kou, Sindo, $e advisor
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3234868