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gas-tungsten arc welding
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Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003206
EISBN: 978-1-62708-199-3
... Abstract Arc welding methods can be classified into shielded metal arc welding, flux-cored arc welding, submerged arc welding, gas metal arc welding, gas tungsten arc welding, plasma arc welding, plasma-metal inert gas (MIG) welding, and electroslag and electrogas welding. This article provides...
Abstract
Arc welding methods can be classified into shielded metal arc welding, flux-cored arc welding, submerged arc welding, gas metal arc welding, gas tungsten arc welding, plasma arc welding, plasma-metal inert gas (MIG) welding, and electroslag and electrogas welding. This article provides information on process capabilities, principles of operation, power sources, electrodes, shielding gases, flux, process variables, and advantages and disadvantages of these arc welding methods. It presents information about the arc welding procedures of hardenable carbon and alloy steels, cast irons, stainless steels, heat-resistant alloys, aluminum alloys, copper and copper alloys, magnesium alloys, nickel alloys, and titanium and titanium alloys.
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.9781627081733
EISBN: 978-1-62708-173-3
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.9781627081740
EISBN: 978-1-62708-174-0
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003208
EISBN: 978-1-62708-199-3
... welded; weld quality in most metals is equal to or superior to that produced by gas tungsten arc welding (GTAW). Because the total kinetic energy of the electrons can be concentrated onto a small area on the workpiece, power densities as high as 10 8 W/cm 2 (10 7 W/in. 2 ) can be achieved. That is...
Abstract
This article discusses the principles of operation, equipment needed, applications, and advantages and disadvantages of various fusion welding processes, namely, oxyfuel gas welding, electron beam welding, stud welding, laser beam welding, percussion welding, high-frequency welding, and thermite welding.
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005345
EISBN: 978-1-62708-187-0
... tungsten arc welding (GTAW), and flux cored arc welding (FCAW). The SMAW process is very portable, used for structural applications where accessibility is limited, and historically has been very versatile. The GMAW process is gaining popularity because of an increasing supply of filler metal options and...
Abstract
Repair welding is a necessary operation for most fabricators and can cost more than the price of the original component if performed improperly. This article provides a discussion on the repair welding of castings for ferrous and nonferrous materials. The discussion focuses on surface preparation, weld repair process selection, joint selection, filler metal selection, weld repair considerations, deposition techniques, postweld heat treatment, and verification of weld repair quality.
Book Chapter
Book: Corrosion: Materials
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003817
EISBN: 978-1-62708-183-2
... environmental cracking resistance of the cobalt alloys. Three welding processes that are used for hardfacing with the high-carbon Co-Cr-W alloys, namely, oxyacetylene, gas tungsten arc, and plasma-transferred arc are also discussed. The article examines the effects of various modes of high-temperature corrosion...
Abstract
This article addresses the cobalt and cobalt-base alloys most suited for aqueous environments and those suited for high temperatures. The performance of cobalt alloys in aqueous environments encountered in commercial applications is discussed. The article provides information on the environmental cracking resistance of the cobalt alloys. Three welding processes that are used for hardfacing with the high-carbon Co-Cr-W alloys, namely, oxyacetylene, gas tungsten arc, and plasma-transferred arc are also discussed. The article examines the effects of various modes of high-temperature corrosion. It describes the applications and fabrication of cobalt alloys for high-temperature service.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003205
EISBN: 978-1-62708-199-3
... Flux-cored arc welding Gas tungsten arc welding Plasma arc welding Electroslag welding Electrogas welding Resistance welding Flash welding Oxyfuel welding Diffusion welding Friction welding Electron beam welding Laser beam welding Torch brazing Furnace brazing Induction brazing...
Abstract
This article discusses different types of joining processes, including welding, brazing, soldering, mechanical fastening, and adhesive bonding. It examines two broad classes of welding: fusion welding and solid-state welding. The article discusses the process selection considerations for welding, brazing, and soldering. It also describes joint design considerations such as selection of weld joints and welds.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001282
EISBN: 978-1-62708-170-2
... a tungsten cathode and a water-cooled copper anode. An electric arc is initiated between the two electrodes using a high-frequency discharge and then sustained using dc power. The arc ionizes the gas, creating a high-pressure gas plasma. The resulting increase in gas temperature, which may exceed...
Abstract
This article introduces thermal spray coatings and describes the various types of coating processes and coating devices, including the flame spray, electric-arc spray, plasma spray, transferred plasma arc, high-velocity oxyfuel, and detonation gun. It provides information on the surface preparation methods and finishing treatments of coated parts. The article also explains the tests to evaluate the coating quality and the effects of coating structures and mechanical properties on coated parts. It concludes with a discussion on the uses of thermal spray coatings.
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005338
EISBN: 978-1-62708-187-0
... shrinkage voids. Unless a given casting is designed for use with these voids present, it will be necessary to remove them. Suitable excavation and weld repair then become necessary steps in the production of zirconium castings. Weld repair is performed using gas tungsten arc welding (GTAW). Welding can be...
Abstract
This article describes typical foundry practices used to commercially produce zirconium castings. The foundry practices are divided into two sections, namely, melting and casting. The article discusses various melting processes, such as vacuum arc skull melting, induction skull melting, and vacuum induction melting, and various casting processes, such as rammed graphite casting, static and centrifugal casting, and investment casting. It explains the evaluation and testing of the process. The article provides information on the mechanical and chemical properties of zirconium castings.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003157
EISBN: 978-1-62708-199-3
... arcing, welding, or sticking. Where these characteristics are important, copper-tungsten or copper-graphite mixtures are used. However, when used in a helium atmosphere, a Cu-CdO contact performs similarly to an Ag-CdO contact. Copper alloys are used for high currents in vacuum interrupters. Pure...
Abstract
Electrical contacts are metal devices that make and break electrical circuits. This article describes the property requirements such as electrical conductivity, mechanical properties, chemical properties, fabrication properties, and thermal properties of make-break arcing contacts. The article also focuses on brush contact materials and their interdependence factors for sliding contacts. In addition, the article discusses the properties, manufacturing methods, and applications of electrical contact materials, including wrought materials such as copper metals, silver metals, gold metals, precious metal overlays, tungsten, molybdenum, and aluminum, and composite materials. It concludes by discussing the composite manufacturing methods such as infiltration, press-sinter, press-sinter-repress process, press-sinter-extrude process, internal oxidation, and preoxidized-press-sinter-extrude process, and coprecipitation.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001280
EISBN: 978-1-62708-170-2
... Molybdenum alloys 1040–1150 1900–2100 4–16 Tantalum alloys 1040–1150 1900–2100 4–12 Tungsten alloys 1040–1370 1900–2500 3–16 (a) Tolerances: ±6 °C (±10 °F) at 1040 °C (1900 °F);±14 °C (±25 °F) at 1260 °C (2300 °F). (b) Tolerance, ±10 min Table 12 Hardness of three ceramic...
Abstract
Ceramic coatings are applied to metals to protect them against oxidation and corrosion at room temperature and at elevated temperatures. This article provides a detailed account of the factors to be considered when selecting a ceramic coating and describes the characteristics of various coating materials, namely, silicate glasses, oxides, carbides, silicides, and cermets. It reviews ceramic coating methods: brushing, spraying, dipping, flow coating, combustion flame spraying, plasma-arc flame spraying, detonation gun spraying, pack cementation, fluidized-bed deposition, vapor streaming, troweling, and electrophoresis. The article also includes information on the evaluation of the quality of ceramic coatings.
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004001
EISBN: 978-1-62708-185-6
... as 0.1 to 6 at.% of secondary alloying elements such as niobium, chromium, manganese, vanadium, tantalum, and tungsten. In the sections that follow, the processing of near-gamma titanium aluminide alloys via wrought, ingot-metallurgy and powder-metallurgy routes is described. All alloy compositions...
Abstract
This article reviews the bulk deformation processes for various aluminide and silicide intermetallic alloys with emphasis on the gamma titanium aluminide alloys. It summarizes the understanding of microstructure evolution and fracture behavior during thermomechanical processing of the gamma aluminides with particular reference to production scaleable techniques, including vacuum arc and cold-hearth melting, isothermal forging, conventional hot forging, and extrusion. The selection and design of manufacturing methods, in the context of processing-cost trade-offs for gamma titanium aluminide alloys, are also discussed.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003116
EISBN: 978-1-62708-199-3
.... Other very commonly used processes for stainless steels are gas-tungsten arc welding (GTAW), gas-metal arc welding (GMAW), submerged arc welding (SAW), flux-cored arc welding (FCAW), and several forms of resistance welding. The plasma arc welding (PAW), laser-beam welding (LBW), and electron-beam...
Abstract
Fabrication of wrought stainless steels requires use of greater power, more frequent repair or replacement of processing equipment, and application of procedures to minimize or correct surface contamination because of its greater strength, hardness, ductility, work hardenability and corrosion resistance. This article provides a detailed account of such difficulties encountered in the fabrication of wrought stainless steel by forming, forging, cold working, machining, heat treating, and joining processes. Stainless steels are subjected to various heat treatments such as annealing, hardening, and stress relieving. Stainless steels are commonly joined by welding, brazing, and soldering. The article lists the procedures and precautions that should be instituted during welding to ensure optimum corrosion resistance and mechanical properties in the completed assembly.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003162
EISBN: 978-1-62708-199-3
...) Gas tungsten arc (GTA) Bare cast or tubular rod Gas metal arc (GMA) Tubular or solid wire Open arc Tubular wire (flux cored) Submerged arc Tubular or solid wire Plasma-transferred arc (PTA) Powder In choosing the process to be used, the following factors are important...
Abstract
Hardfacing is defined as the application of a wear-resistant material, in depth, to the vulnerable surfaces of a component by a weld overlay or thermal spray process Hardfacing materials include a wide variety of alloys, carbides, and combinations of these materials. Iron-base hardfacing alloys can be divided into pearlitic steels, austenitic (manganese) steels, martensitic steels, high-alloy irons, and austenitic stainless steel. The types of nonferrous hardfacing alloys include cobalt-base/carbide-type alloys, laves phase alloys, nickel-base/boride-type alloys, and bronze type alloys. Hardfacing applications for wear control vary widely, ranging from very severe abrasive wear service, such as rock crushing and pulverizing to applications to minimize metal-to-metal wear. This article discusses the types of hardfacing alloys, namely iron-base alloys, nonferrous alloys, and tungsten carbides, and their applications and advantages.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003132
EISBN: 978-1-62708-199-3
... or bead. The external flash is always removed, providing a smooth external surface. The internal flash is also removed by scarfing, providing a smooth, clean internal surface. For fusion-welded tube, the edges of the strip are brought together and welded, usually by a gas tungsten arc welding...
Abstract
This article discusses the applications and tensile properties of selected copper tube alloys, as well as the methods for producing copper tubular products, namely extrusion and rotary piercing. It explains the methods available for the finishing of copper tubular products, such as tube welding, cold drawing, and tube reducing. The article lists the standard dimensions and tolerances for several kinds of copper tubes and pipes in the ASTM specifications, along with other requirements for the tubular products.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001303
EISBN: 978-1-62708-170-2
... or tubular rod (stick electrode) Gas-tungsten arc (GTAW) Bare cast or tubular rod Gas-metal arc (GMAW) Tubular or solid wire Flux-cored open arc Tubular wire (flux cored) Submerged arc (SAW) Tubular or solid wire Plasma transferred arc (PTA) Powder Laser beam Powder...
Abstract
This article provides a brief review of the classification and characteristics of cast irons. It describes the processes used to clean iron castings, including mechanical cleaning and finishing and nonmechanical cleaning. The article discusses surface treatments used to extend casting life when resistance to corrosion, wear, and erosion is required. The common methods include electroplating, electroless plating, hardfacing, weld cladding, surface hardening, porcelain enameling, and organic coatings.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003217
EISBN: 978-1-62708-199-3
... application. It also provides information on weld-overlay and thermal spray coating, porcelain enameling, and the preparation of enamel frits for steels. The article closes by describing methods and materials for ceramic coating. ceramic coatings chemical conversion coatings continuous...
Abstract
There are various coating techniques in practice to prevent the deterioration of steels. This article focuses on dip, barrier, and chemical conversion coatings and describes hot-dip processes for coating carbon steels with zinc, aluminum, lead-tin, and other alloys. It describes continuous electrodeposition for steel strip and babbitting and discusses phosphate and chromate conversion coatings as well. It also addresses painting, discussing types and selection, surface preparation, and application methods. In addition, the article describes rust-preventive compounds and their application. It also provides information on weld-overlay and thermal spray coating, porcelain enameling, and the preparation of enamel frits for steels. The article closes by describing methods and materials for ceramic coating.
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005336
EISBN: 978-1-62708-187-0
... 1500 187 27.1 … … 34 62 9 925 1700 … … … … … 38 5.5 The CW-12MW and CW-7M grades have a relatively high yield strength ( Table 3 ) due to the solution-hardening effects of chromium, molybdenum, and silicon in CW-7M and of tungsten and vanadium in CW-12MW. Ductility is excellent...
Abstract
Nickel-base alloy castings are widely used in corrosive-media and high-temperature applications. This article begins with a discussion on the compositions of corrosion-resistant nickel-base casting alloys and heat-resistant nickel-base casting alloys. It describes the effects of aluminum and titanium on the structure and properties of nickel-base alloys. The article provides information on the melting, foundry, and pouring practices for nickel-base alloys. It describes the welding and heat treatment of the nickel-base casting alloys. The article concludes with information on the numerous applications of cast heat-resistant nickel-base alloys.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006024
EISBN: 978-1-62708-172-6
... prepared at the same time, making the surface preparation between the two seamless. Weld spatter may be present on metal sections that were welded together using stick, flux core, gas metal arc, or gas tungsten arc methods. Weld spatter is typically not present when submerged arc welding is performed but...
Abstract
This article reviews the steps involved in presurface-preparation inspection: substrate replacement; removal of weld spatter, rounding of sharp edges, and grinding of slivers/laminations; and removal of rust scale, grease, oil, and chemical (soluble salt) contamination. It focuses on surface preparation methods that range from simple solvent cleaning to hand and power tool cleaning, dry and wet abrasive blast cleaning, centrifugal wheel blast cleaning, chemical stripping, and waterjetting for the application of the coating system. In addition, the article provides a description of the Society for Protective Coatings' (SSPC) standards and NACE International standards as well as the International Organization for Standardization (ISO) standards and International Concrete Repair Institute (ICRI) guidelines for surface cleanliness.
Book Chapter
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005348
EISBN: 978-1-62708-187-0
... graphite GTAW gas tungsten arc welding h hour h height H enthalpy; height; magnetic field strength HAZ heat-affected zone HB Brinell hardness hcp hexagonal close-packed HIP hot isostatic pressing HK Knoop hardness hp horsepower HR Rockwell...