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weld pool

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290023
EISBN: 978-1-62708-306-5
... oxidation. Shielding gases are used to protect the molten metal from atmospheric nitrogen and oxygen as the weld pool is being formed. The shielding gas also promotes a stable arc and uniform metal transfer. In gas metal arc welding (GMAW) and flux cored arc welding (FCAW), the gas used has...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290099
EISBN: 978-1-62708-306-5
... with the oxyacetylene process. It is inherently slow and does not require rapid response time in order to control the size of the weld puddle. Greater skill is needed to control the more rapid fluctuations in arc processes. The weld pool created by the high-heat-intensity processes, such as laser beam and electron beam...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310201
EISBN: 978-1-62708-286-0
... Marangoni effect. This effect exploits the temperature-dependent surface concentration of sulfur in the weld pool, which causes a decreased surface tension toward the hotter center of the pool, causing the molten pool to flow toward the center on the surface and then flow downward, shooting the hottest...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560309
EISBN: 978-1-62708-291-4
... nonmetallic inclusions. Unetched. 1000×. (f) Weld interface. Arrows indicate the width of partly melted zone at the weld interface. Aqueous picral. 50×. Fig. 11.15 (Part 3) (g) Shape of a typical weld pool and the direction of growth of columnar grains of weld metal as the pool moves...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230401
EISBN: 978-1-62708-298-3
... effective heat input will minimize the grain size as well as provide a narrow HAZ (heat input (joules/meter) = [(current × voltage)/(welding speed)]; current × voltage is in joules/second, and speed is in meters/second). High travel speeds are to be avoided, because the elongation of the weld pool increases...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290079
EISBN: 978-1-62708-306-5
... welding include the ability to control heat input, bridge large gaps, avoid melt-through, and clearly view the weld pool. Carbon steel sheet, formed in a variety of shapes, often can be welded more economically by oxyfuel gas welding than by other processes. Oxyfuel gas welding is capable of joining small...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030112
EISBN: 978-1-62708-282-2
... to that of properly annealed base metal because of: Microsegregation Precipitation of secondary phases Formation of unmixed zones Recrystallization and grain growth in the weld heat-affected zone (HAZ) Volatilization of alloying elements from the molten weld pool Contamination of the solidifying...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200369
EISBN: 978-1-62708-354-6
... is added to the molten weld pool in a similar manner to oxy-fuel gas welding ( Figure 25-2 ). The advantage of the GTAW process is the availability of filler metal for stainless and high alloys. While many of the common alloys are available in bare wire form, variations in alloy content, or exotic alloys...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280149
EISBN: 978-1-62708-267-9
... 25 (L-605) 1175–1230 2150–2250 1040 1900 Conditions for gas tungsten arc welding of superalloys Table 9.4 Conditions for gas tungsten arc welding of superalloys Base-metal thickness, in. (mm) Diameter of filler metal (a) , in. (mm) Electrode diameter (b) , in. (mm) Shielding...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610585
EISBN: 978-1-62708-303-4
... high-speed welding to improve productivity can have detrimental effects. Formation of a teardrop-shaped weld pool, which may occur as the weld travel speed increases, can result in centerline solidification cracks. The solidification pattern associated with this type of weld pool...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430351
EISBN: 978-1-62708-253-2
... profile across the weld region; HAZ, heat-affected zone; PM, parent metal Fig. 6.164 Longitudinal cut section of the tube near puncture, in macro-etched condition showing weld pool having porosities and uneven bead indicating lack of penetration Fig. 6.165 Low-magnification views...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030096
EISBN: 978-1-62708-282-2
... and grain growth in the weld heat-affected zone (HAZ) Volatilization of alloying elements from the molten weld pool Contamination of the solidifying weld pool Corrosion resistance can usually be maintained in the welded condition by: Balancing alloy compositions to inhibit certain...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820043
EISBN: 978-1-62708-339-3
... pool of the austenitic stainless steels also tends to be more viscous, or “sluggish,” than ferritic and martensitic grades. This impedes the metal flow and wettability of welds in these materials, which may promote lack-of-fusion defects. A major concern, when welding the austenitic stainless...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720411
EISBN: 978-1-62708-305-8
... penetration is less than that specified Craters: Depressions at the termination of a weld bead or in the molten weld pool Melt-through: A condition resulting when the arc melts through the bottom of a joint welded from one side Spatter: Metal particles expelled during welding and deposited...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120065
EISBN: 978-1-62708-269-3
.... These solute-enriched or solute-depleted bands normally appear as curvilinear contours on the polished and etched weldment surface and are attributed to thermal variations in the weld pool, which periodically change the solid-liquid interface velocity. Transverse solute banding has occurred using both arc...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820001
EISBN: 978-1-62708-339-3
... zone (HAZ) Volatilization of alloying elements from the molten weld pool Contamination of the solidifying weld pool Corrosion resistance can usually be maintained in the welded condition by balancing alloy compositions to inhibit certain precipitation reactions, by shielding molten and hot...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820169
EISBN: 978-1-62708-339-3
... Thermal Conductivity Most metals and alloys are relatively good conductors of heat, but some are much better than others. Rapid conduction of heat from the molten weld pool by an adjacent base metal may affect the energy input required to locally melt the base metal. When two dissimilar metals...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060117
EISBN: 978-1-62708-261-7
... and the weld pool ( Fig. 6.26 ). This welding process has its origins in the 1800s, but it was not until the early 1900s that coverings for these electrodes began to be developed. In the 1930s this method of welding began to grow in popularity and retains an important role in the welding industry. The SMAW...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280041
EISBN: 978-1-62708-267-9
.../argon oxygen decarburization melting, vacuum induction melting, vacuum arc remelting, and electroslag remelting. It also addresses related issues such as consumable remelt quality, control anomalies, melt pool characteristics, and melt-related defects, and includes a section that discusses the processes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310155
EISBN: 978-1-62708-286-0
...) welding penetration (see Chapter 17 ) and at high levels (0.15%+) for machinability (see Chapter 15 ). These trade-offs, which are beneficial to processors, should be viewed with skepticism by end users, whose product integrity is compromised. There are processing methods for which higher levels...