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shielding gas

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0047645
EISBN: 978-1-62708-229-7
... cracks to form and propagate in tension under the thermal stresses created by the repair-weld heat input. The crack resulted from contamination and embrittlement of a repair weld that had received inadequate gas shielding. Thermal stresses cracked the oxide-rich layer that formed. The gas-shielding...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001508
EISBN: 978-1-62708-236-5
...-P-408 gas turbine (turbojet) engines, involves the rework and/or replacement of many components including the fuel nozzle heat shields. These heat shields, which are fabricated by press forming from annealed type 321 corrosion resistant steel (CRES) sheet, are utilized to keep hot combustion gases...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0091362
EISBN: 978-1-62708-220-4
.... The increase in the weld nitrogen level was a direct result of inadequate argon gas shielding of the molten weld puddle. Two areas of inadequate shielding were identified: improper gas flow rate for a 19 mm (0.75 in.) diam gas lens nozzle, and contamination of the manifold gas system. Recommendations included...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047641
EISBN: 978-1-62708-235-8
...Abstract Abstract A Ti-6Al-4V alloy pressure vessel failed during a proof-pressure test, fracturing along the center girth weld. The girth joints were welded with the automatic gas tungsten arc process utilizing an auxiliary trailing shield attached to the welding torch to provide inert-gas...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001043
EISBN: 978-1-62708-214-3
...Abstract Abstract A 76 mm (3 in.) type 304 stainless steel tube that was used as a heat shield and water nozzle support in a hydrogen gas plant quench pot failed in a brittle manner. Visual examination of a sample from the failed tube showed that one lip of the section was eroded from service...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001818
EISBN: 978-1-62708-241-9
...Abstract Abstract A sleeve-shaped fire shield that operates inside one of two burner trains in an oil and gas processing unit ruptured after 15 y of service. A detailed analysis was conducted to determine how and why the sleeve failed. The investigation included visual inspection, chemical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001647
EISBN: 978-1-62708-235-8
... (GTAWs) Cause Potential Observations Relating to Cause Surface contamination Presence of contaminants potentially detectable before or after welding Random distribution of porosity Poor shield gas coverage Surface discoloration from oxidation Random distribution of porosity...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003509
EISBN: 978-1-62708-180-1
... at the weld toe Cracks—hot or cold, longitudinal or transverse, crater and at weld toe Gas porosity Arc strike Spatter Backing piece left on: failure to remove material placed at the root of a weld joint to support molten weld metal Subsurface features that are causes for rejection...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0047558
EISBN: 978-1-62708-236-5
... using a low-carbon steel filler wire (0.04C-1.15Mn-0.50Si) and a shielding gas containing 75% argon and 25% carbon dioxide. Preheating and postheating were not used, nor was the rebuilt surface nondestructively tested for cracks. The shaft was remachined to size, and a new keyway was cut in a different...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001667
EISBN: 978-1-62708-235-8
... into titanium surfaces is greatly increased during welding operations unless the environment is strictly controlled. Argon is generally used as a shielding gas in the tungsten-arc welding of titanium. The weld was produced in a four step process: (1) tack welded in eight areas to assure alignment...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001447
EISBN: 978-1-62708-235-8
... the electrical conductivity and a small amount of oxygen is unavoidable in materials for conductors in electrical engineering. In gas welding even a neutral oxygen-acetylene flame will cause “gassing” as seen in Figure 11 . Although the use of a shielding gas will serve to prevent this to a large extent...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001782
EISBN: 978-1-62708-241-9
... interstitial atoms during welding. Typical precautions include properly de-greasing and cleaning the work pieces prior to welding and using a suitable shielding gas. References References 1. Shira C.S. , Froes F.H. : Advanced materials in golf clubs: the titanium phenomenon . J. Met. 49...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001304
EISBN: 978-1-62708-215-0
... ER309 filler metal ( Ref 1 ) and 98Ar-2O 2 shielding gas. The bellows assembly consisted of an expansion bellows (Inconel 600) bolted to circumferential intake and exit flanges (Corten). The field failure occurred near the intake end of the exhaust diffuser assembly and involved material fracture...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001041
EISBN: 978-1-62708-214-3
...-alloy steel, and to include a fillet-welded diaphragm, as detailed in Fig. 5 . Welding was performed with the gas metal arc process using 1.1 mm (0.045in.) diam AWS A5.18 ER70S-6 filler metal and a 75% argon/25% CO 2 shielding gas. The welding procedure was governed by an in-house specification based...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001145
EISBN: 978-1-62708-217-4
.... The breech chamber and cartridge chamber are joined by means of a bayonet closure. The cartridge is fired electrically and the hot gases generated exit through the exhaust port on the top of the breech chamber. To prevent overheating of the chamber dome there are two Inconel heat shields welded inside...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001207
EISBN: 978-1-62708-235-8
...Abstract Abstract Pipes made of low-carbon Thomas steel had been welded longitudinally employing the carbon-arc process with bare electrode wire made for argon-shielded arc welding. Difficulties were encountered during the cutting of threads because of the presence of hard spots...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001632
EISBN: 978-1-62708-234-1
... . This area is isolated from the remainder of LANSCE by several meters of iron and concrete shielding to stop neutron particle radiation during operation and shield against radioisotope decay radiation at all times. The APT program wanted to obtain the largest possible proton fluence on specimens during...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001837
EISBN: 978-1-62708-241-9
... as that of steel sheet. Argon gas of 99.99% purity was used for shielding. No further heat treatment was carried out after welding. No cracks were observed in the weld joint and adjacent area during visual inspection after welding. However, radiography of the whole part revealed some cracks adjacent...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006784
EISBN: 978-1-62708-295-2
... during subsequent cooling. The use of vacuum melting and the modification of compositions can reduce susceptibility to hydride formation. Hydrogen can often be removed by annealing in vacuum. Welding generally requires the use of inert gas shielding to minimize hydrogen pickup. The hydride particles...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003552
EISBN: 978-1-62708-180-1
.... The sensitivity to hydrogen embrittlement from formation of hydrides varies with alloy composition and is reduced substantially by alloying with aluminum. Care should be taken to minimize hydrogen pickup during fabrication. Welding operations generally require inert gas shielding to minimize hydrogen pickup...