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joint design

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089738
EISBN: 978-1-62708-235-8
... that the crack in the header tube was the result of a stress concentration at the toe of the weld joining a doubler collar to the tube. The stress concentration was caused by undercutting from poor welding technique and an unfavorable joint design that did not permit a good fit-up. Recommendations included...
Image
Published: 01 June 2019
Fig. 1 Schematic of Typical Expansion Joint Design. More
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006828
EISBN: 978-1-62708-329-4
... of the material, joint design, prebraze cleaning, brazing procedures, postbraze cleaning, and quality control. Factors that must be considered include brazeability of the base metals; joint design and fit-up; filler-metal selection; prebraze cleaning; brazing temperature, time, atmosphere, or flux; conditions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001594
EISBN: 978-1-62708-229-7
..., such as mechanical vibration, internal pulsation, joint design, and welding workmanship; and 3) implications of a leaking crack on plant safety. TU Electric has implemented the use of modified welding techniques for the fabrication of socket-welded joints that are expected to improve their ability to tolerate...
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
... of the undercut, which was an inherent stress raiser. Recommendations included revised joint design to ensure full root penetration. Fillet welds Heat affected zone Joint design Papermaking Shells (structural forms) Steam preheaters Weld defects Welded steel (Steel, general) Joining-related failures...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0089722
EISBN: 978-1-62708-217-4
... as the result of vibration and inadequate support of the hose assembly. Recommendations included changing the joint design from a cylindrical lap joint to a square-groove butt joint. Also, an additional support was recommended for the hose assembly to minimize vibration at the elbow. Aircraft components...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048747
EISBN: 978-1-62708-229-7
... contributed to the failure. Recommendations included changing the joint design to incorporate a large-radius corner and improving fitting of the components to permit full weld penetration. Backing strips were suggested to increase weld quality, and the pipe wall thickness was increased from 8 to 9.5 mm...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001611
EISBN: 978-1-62708-219-8
.... This article examines a case of cold cracking failure in the construction industry. Fortunately, the failure was identified prior to final erection of the structural members and the weld was successfully reworked. The article explains how various welding parameters, such as electrode/wire selection, joint...
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
... imperfections may be tolerable and how the other may be root-cause defects in service failures. The article explains the effects of joint design on weldment integrity. It outlines the origins of failure associated with the inherent discontinuity of welds and the imperfections that might be introduced from arc...
Image
Published: 01 June 2019
Fig. 1 Carbon steel discharge line at a cooling tower that failed because of poor fit-up at Y-joint and poor-quality welds. (a) Original joint design of pipe connection and location of cracks. Photograph is an oblique view of a section through the weldment, showing the abrupt intersection More
Image
Published: 01 June 2019
Fig. 1 Weld attaching the head to the shell of a steam preheater that cracked because of poor root penetration in original and first replacement joint designs. (a) and (b) Sections taken through the head-to-shell joint. Etched in hot 50% hydrochloric acid. Actual size. The section More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001661
EISBN: 978-1-62708-229-7
... in the joint design. And third, the normal weld metal shrinkage induces tension stress on the weld, often resulting in cracks. The cracks originating from the slag pockets tend to relieve stresses. The cracks initiate immediately or shortly after the plate weld is completed. Further propagation should...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0089766
EISBN: 978-1-62708-224-2
... of low-carbon low-alloy steel that was welded to an AISI 1025 steel tube, and the improved design included placing the welded joint of the flange farther away from the flange fillet. Investigation (visual inspection and chemical analysis) supported the conclusion that the failures in the flanges...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0091048
EISBN: 978-1-62708-235-8
.... Cracking (fracturing) Heat exchangers Weld defects Welded joints Ferritic stainless steel Brittle fracture Joining-related failures A welded ferritic stainless steel heat exchanger cracked prior to service. The sheet steel weld joint design is depicted in Fig. 1(a) . The welding filler metal...
Image
Published: 01 June 2019
Fig. 1 Type 347 stainless steel inlet header for fuel-to-air heat exchanger that cracked due to poor welding technique and unfavorable joint design. Dimensions given in inches More
Image
Published: 01 June 2019
Fig. 1 Cracking of a welded ferritic stainless steel heat exchanger. (a) Diagram showing the heat-exchanger weld joint design. (b) The transverse crack that occurred through the weld. 5.9├Ś. (c) Metallographic profile of the weld near the cracking, showing melt-through, grain growth More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001682
EISBN: 978-1-62708-229-7
..., pumps and expansion joints. The expansion joints in both the primary and secondary coolant systems are designed to reduce thermal stresses in the piping and to facilitate component replacement in, and alignment of, the systems. A typical expansion joint design is illustrated in Figure 1 . Details...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006808
EISBN: 978-1-62708-329-4
.... In this case, the testing performed is nondestructive to ascertain the quality of the welded joint. The tests are intended to characterize the discontinuities present in a weld in terms of size and location and to determine if they are acceptable per the design code and/or internal user requirements. Some...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0089752
EISBN: 978-1-62708-219-8
... killed ingots. Aqueducts Ductile brittle transition Fillet welds Joint design Piping Preheating Stress concentration Welding defects ASTM A572 grade 42 Type 2 Brittle fracture Joining-related failures A 208 cm (82 in.) ID steel aqueduct fractured circumferentially at two points 152 m...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001055
EISBN: 978-1-62708-214-3
... be investigated. The test data and observations show that although the material met specifications, some of the steel was extremely notch sensitive, that is, lacked impact toughness. It also appears that the joint design was constrained and that the intersection of the spiral and girth welds acted as a stress...