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tack welding

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Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001088
EISBN: 978-1-62708-214-3
...Abstract Abstract A 25 mm (1 in.) diam carrier shaft failed suddenly during operation. The shaft failed near the toe of the 4.8 mm (316 in.) frame-to-shaft 60 deg and 120 deg submerged metal arc (SMA) tack welds after an unknown time in service. Material specifications called for the shaft...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001395
EISBN: 978-1-62708-220-4
... ring on the shell side behind the tack welds securing the backing strip to the shell. Intermittent pitting had also occurred along the head side of the weld at the other end the vessel. There was no pitting along the main longitudinal weld of the shells in any vessel nor around any of the branches set...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047632
EISBN: 978-1-62708-235-8
... integral boss on one side. After annealing, hot spinning, annealing a second time, and tack welding a port fitting, the assembly was torch preheated to 120 to 150 deg C (250 to 300 deg F). The port fitting was then welded in place. Final full heat treatment to the T62 temper was followed by machining...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0047529
EISBN: 978-1-62708-230-3
...Abstract Abstract A weld that attached the head to the shell of a preheater containing steam at 1.4 MPa (200 psi) and was used in the manufacture of paper cracked in service. The original joint contained a 6.4 by 50 mm backing ring that had been tack welded to the inside surface of the shell...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001580
EISBN: 978-1-62708-229-7
... is back-filled with helium and welded closed. The Gas Tungsten Arc Welding (GTAW) autogenous process is used to close the canister. The canister is clamped in place and the GTAW electrode is moved around the outside of the canister. Before the continuous weld is started, three tacks approximately 90...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001206
EISBN: 978-1-62708-235-8
... type 35.8 were oxyacetylene welded to collectors of greater wall thickness with a round bead. X-ray examination showed crack initiation in the interior of the nipples close to the root of the weld seam. Welding was performed in a horizontal position. After tacking at two laterally facing locations...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0048733
EISBN: 978-1-62708-235-8
.... The crack, which extended the length of the hot well, was completely internal and could not be detected from outside the vessel. The intermediate tube supports were tack welded to the heater shell. The welds nearest the crack were broken and were covered with high-temperature oxidation, indicating...
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
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001821
EISBN: 978-1-62708-241-9
... at fracture. Note lack of substantial grain elongation. Metallographic examination showed the unusual rough area 117 cm (46 in.) from the end of the tank to be a small surface weld ( Fig. 10 ). This may have been a tack weld made as part of the tank fabrication process and subsequently ground off...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001817
EISBN: 978-1-62708-180-1
... at welded joints because of overstress during normal operation. Dimensions given in inches Fig. 15 Titanium heat-exchanger tube (ASTM B337, grade 2) that became embrittled and failed because of absorption of hydrogen and oxygen at elevated temperatures. (a) Section of the titanium tube...
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
...Abstract Abstract This article briefly reviews the general causes of weldment failures, which may arise from rejection after inspection or failure to pass mechanical testing as well as loss of function in service. It focuses on the general discontinuities observed in welds, and shows how some...