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melt-zone configuration

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290079
EISBN: 978-1-62708-306-5
... to 25.4 mm (0.105 to 1.00 in.). Fig. 4.6 Common stud configurations for stud arc welding. Source: Ref 4.3 4.4 Capacitor Discharge Stud Welding Capacitor discharge stud welding is a stud welding process in which the tip of the stud melts almost instantly when energy stored in capacitors...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1988
DOI: 10.31399/asm.tb.eihdca.t65220281
EISBN: 978-1-62708-341-6
.... In this method, the material is incrementally melted while being gradually moved through an induction coil, thus producing a narrow molten zone. The impurities tend to remain in the narrow molten zone, much as slag is formed in conventional melting. Thus they are driven to one end of the bar as it proceeds...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870183
EISBN: 978-1-62708-314-0
... Consolidation of melt-fusible thermoplastics consists of heating, consolidation, and cooling, as depicted schematically in Fig. 6.1 . As with thermoset composites, the main processing variables are time ( t ), temperature ( T ), and pressure ( P ). Heating can be accomplished with infrared heaters, convection...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060085
EISBN: 978-1-62708-261-7
... freeze and melt over a temperature range . The result is a so-called mushy zone for alloy solidification under equilibrium conditions (see Chapter 2 and Fig. 2.32 ). The mushy zone represents the temperature extremes between which a two-phase solid/liquid composition is present. The temperature...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290001
EISBN: 978-1-62708-306-5
... and the parent metal is an HAZ that did not melt during welding but reached very high temperatures. Grain growth due to the high temperatures is commonly encountered in the HAZ. Fig. 1.3 Weld bead geometry showing fusion zone, heat-affected zone, and base metal. Source: Ref 1.3 The types of welds...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250077
EISBN: 978-1-62708-345-4
... the melting feedstock. A vacuum is usually applied to the vent, and a specially designed screw is required to depressurize the melt in the region of the vent to keep it from extruding through the vent. The reciprocating screw usually has three successive zones, each with specific functions: The feed zone...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290137
EISBN: 978-1-62708-306-5
... of the metals at the bond zone shows clearly that the metals did not melt but flowed plastically during the process. Electron microprobe analysis across such plastically deformed areas shows that no diffusion occurs because of extremely rapid self-quenching of the metals. Fig. 6.23 Bond zone pattern...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930057
EISBN: 978-1-62708-359-1
... of the wrong type of weld joint for a given application, or undesirable changes in cross section. Process-related discontinuities include: Undercut: A groove melted into the base metal adjacent to the toe or root of a weld and left unfilled by weld metal Slag inclusions: Nonmetallic solid...
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
...). However, only simple geometric shapes can be joined (e.g., a plate to a plate or a tube to a tube plate). The bond can be made with little generation of heat, and there need be no melting or development of heat-affected zones; in this sense, explosive welding is a solid-state welding process...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740047
EISBN: 978-1-62708-308-9
... Abstract This chapter covers the practices and procedures used for shape casting metals and alloys. It begins with a review of the factors that influence solidification and contribute to the formation of casting defects. It then describes basic melting methods, including induction, cupola...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420087
EISBN: 978-1-62708-310-2
... are in three-phase equilibrium with the liquid at point P , an invariant point that occurred by coincidence. Then, if this two-phase field in the solid region is even further widened so that the solvus lines no longer touch at the invariant point, the diagram passes through a series of configurations, finally...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930353
EISBN: 978-1-62708-359-1
... superalloy inserts may be placed at the contact points in the fixture if melting becomes a problem. Molybdenum-Alloy Weld Properties The weldability of molybdenum and its alloys is marginal, because of a high DBTT in the welded and recrystallized zones. Factors influencing ductility are summarized...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780359
EISBN: 978-1-62708-281-5
... and a reference as the material is heated or cooled ( Ref 5 ). The technique is used to evaluate thermal transitions within a material. Such transitions include melting, evaporation, crystallization, solidification, cross linking, chemical reactions, and decomposition. A typical DSC result is presented in Fig. 5...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120065
EISBN: 978-1-62708-269-3
..., above approximately 538 °C (1000 °F), to above the melting temperature of the respective alloys. Solidified cast structures can arise in the cast weld metal area. Coarse structures can form in the weld fusion zone or in the heat-affected zone (HAZ) of a fusion-welded joint, due to holding at high...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540215
EISBN: 978-1-62708-309-6
... geometries, specimen configurations, and loading conditions. The discussion covers two- and three-dimensional cracks as well as the use of correction factors and problem-simplification techniques for dealing with nonstandard configurations. The chapter goes on to describe how fatigue loading affects crack...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.pb.t51230207
EISBN: 978-1-62708-351-5
... the relatively simple configuration of a homogeneous filler between two components of the same base material) into four stages, which are identical to those enumerated in section 6.1 : Heating of the assembly from room temperature to the filler melting temperature, during which significant interdiffusion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290099
EISBN: 978-1-62708-306-5
... zone, the unmixed zone, and the partially melted zone ( Fig. 5.7c ). The unmixed zone occurs in welds with filler metal additions and consists of molten base metal and a resolidified zone without mixing with filler metal additions during the movement of the weld pool. Fig. 5.7 The different...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780028
EISBN: 978-1-62708-281-5
... or solution, the chains of all polymers, except liquid crystalline polymers (LCPs), exhibit random or amorphous configurations. Liquid crystalline polymers form randomly arranged rodlike bundles. Upon cooling of the melt or evaporation of the solvent, some polymers remain amorphous whereas others crystallize...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980141
EISBN: 978-1-62708-342-3
.... The structural state at high temperatures can, therefore, be “frozen” by quenching from this temperature so quickly that the atoms have no time to form the room temperature configuration. Peritectic System (Type 4) A peritectic reaction occurs when the melt (field a ) forms a new solid phase...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140047
EISBN: 978-1-62708-335-5
... of hydrogen in aluminum at 1 atm hydrogen pressure The solubility curve for hydrogen in aluminum typically describes equilibrium conditions. No more hydrogen than indicated can be dissolved at any temperature. Control of melting conditions and melt treatment can result in substantially reduced...