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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0047545
EISBN: 978-1-62708-236-5
... was preheated to a temperature above which martensite would form. After completion, the weld was covered with an asbestos blanket, and heating was continued for 24 h. During the next 24 h, the temperature was slowly lowered. The result was a crack-free weld. Heat affected zone Martensite Post heating...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047541
EISBN: 978-1-62708-217-4
... condition that resulted in catastrophic, brittle fracture under normal applied loads. The design was altered to eliminate the weld adjacent to the threaded portion of the rod. Aerospace engines Design Post heating Welded joints Medium-carbon steel Brittle fracture Intergranular fracture Joining...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001161
EISBN: 978-1-62708-220-4
... to be completely martensitic. Thus, the failure was due to hardening of the base material during welding, and recommendation was made to temper or anneal the welded regions to reduce the effects of hydrogen under pressure. Ammonia Chemical processing equipment Heat exchangers Post heating Welded joints...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001519
EISBN: 978-1-62708-223-5
..., possibly caused by a post heat-treat cleaning/pickling process. Part Data The 4340 steel draw-in bolt ( Fig. 1 ) was heat treated to 1515 MPa (220 ksi) tensile strength, then subjected to a cleaning/pickling operation to remove scale. The draw-in bolt and collet are installed in opposite ends...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001430
EISBN: 978-1-62708-236-5
... of the base material, shape of the weld preparation and the welding procedure which involves choice of the welding process, electrodes, size of runs, electrical parameters and pre- or post-heat. The adequacy of the procedure is then demonstrated by a practical test involving both NDT and destructive test...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001433
EISBN: 978-1-62708-235-8
... and the welding procedure which involves choice of the welding process, electrodes, size of runs, electrical parameters and pre- or post-heat. The adequacy of the procedure is then demonstrated by a practical test involving both NDT and destructive test involving both competence of welders subsequently employed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0046155
EISBN: 978-1-62708-233-4
... Abstract A structure had been undergoing fatigue testing for several months when a post-like member heat treated to a tensile strength of 1517 to 1655 MPa (220 to 240 ksi) ruptured. The fracture occurred in the fillet of the post that contacted the edge of a carry-through box bolted...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0047694
EISBN: 978-1-62708-219-8
..., the welded joints withstood the tensile and wrap tests. Austenite Phase transformations Post heating Tempering 1080 UNS G10800 Joining-related failures Extra high strength zinc-coated 1080 steel welded wire, 2.0 ± 0.08 mm (0.080 ± 0.003 in.) in diameter, was wound into seven-wire cable...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001210
EISBN: 978-1-62708-227-3
... Abstract In a shipyard one of the two posts of a loading gear fractured under a comparatively small load at the point where it was welded into the ship’s deck. The post consisted of several pipe lengths that were produced by longitudinal seam welding of 27 mm thick sheets. The sheet metal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001590
EISBN: 978-1-62708-228-0
... Abstract This case study demonstrates that Alloy 601 (UNS N06601) is susceptible to strain-age cracking. The observation illustrates the potential importance of post weld heat treatment to the successful utilization of this alloy in certain applications. Steam reforming Inconel 601 UNS...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001432
EISBN: 978-1-62708-221-1
... of the welding process, electrodes, size of runs, electrical parameters and pre- or post-heat. The adequacy of the procedure is then demonstrated by a practical test involving both NDT and destructive test involving both competence of welders subsequently employed on the job must also be assessed by carrying out...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001431
EISBN: 978-1-62708-221-1
... be beyond question, it is necessary to give adequate consideration to all the relevant factors, e.g., weldability of the base material, shape of the weld preparation and the welding procedure which involves choice of the welding process, electrodes, size of runs, electrical parameters and pre- or post-heat...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001722
EISBN: 978-1-62708-236-5
... by chromium-plating. These temperatures will normally be lower than the tempering temperature of the direct-hardening low and medium alloy steels. In general, therefore, no serious deterioration of mechanical properties will occur as a result of post-plating heat treatment in the range 440–480° C. (825–895° F...
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
... zone) and HAZ. Major welding parameters that affect the quality of the weld are specific heat input, number of passes, inter-pass temperature, pre-heating, post-heating, electrode diameter and restraint during welding. Table 1 summarizes the main welding parameters used to obtain the joint...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001298
EISBN: 978-1-62708-215-0
... by acid etching. Post-plating baking operations subsequently reduced the fatigue strength of the spar. Chemical etching Fatigue strength Mechanical properties Rotor blades 7075-T7351 UNS A97075 Pitting corrosion Fatigue fracture Surface treatment related failures Background...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0048630
EISBN: 978-1-62708-217-4
... to be low-hydrogen in nature, and an adequate post plating baking treatment at 205 deg C (400 deg F), in conformity with ASTM B 242, was specified. A minimum radius for the head-to-shank fillet was specified at 0.25 mm (0.010 in.). All threads were required to be free of burrs. A 10-day sustained-load test...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089774
EISBN: 978-1-62708-235-8
... at the undercut locations. Without the excessive residual stress, the shaft dimensions appeared ample for the service load. Recommendations included applying the fillet weld with more care to avoid undercutting. The residual stresses could be minimized by pre-weld and post-weld heat application. Fillet...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001344
EISBN: 978-1-62708-215-0
... contamination. Additional recommendations were to eliminate these short longitudinal weld joints by using a bracket assembly joint between the tubes, use a post-weld heat treatment to relieve residual welding stress or select a more stress-corrosion cracking resistant alloy for this particular application...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001341
EISBN: 978-1-62708-215-0
... are of a lower alloy. The superheater was built to ASME Section 1 specifications. All the bends were cold bent without post-bend heat treatment. The ASME Code does not require post-bend heat treatment. Performance of the Previous Superheater The previous superheater operated for 100,000 hours. The records...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001436
EISBN: 978-1-62708-235-8
... a microstructure typical of a medium-carbon steel (carbon approximately 0.4%) in the normalized condition, a material not weldable by ordinary methods. It was concluded that the post-welding crack arose primarily from the thermal contraction which developed in the weld metal on cooling. It is probable...