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weld discontinuity

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Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001472
EISBN: 978-1-62708-173-3
... Abstract This article provides an overview of the types of weld discontinuities that are characteristic of specialized welding processes. These welding processes include electron-beam welding, plasma arc welding, electroslag welding, friction welding, resistance welding, and diffusion welding...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005631
EISBN: 978-1-62708-174-0
... discontinuities that are assessed for weld quality of an application. Table 3 Common types of discontinuities Type of discontinuity Location (a) Remarks 1 Porosity WM Porosity could also be found in the base metal and heat-affected zone (HAZ) if the base metal is a casting. (a) Uniformly...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005638
EISBN: 978-1-62708-174-0
... process problems that impact weld quality (to be detected by a weld quality monitoring system) include: Weld speeds on the order of 12 m/min (200 mm/s, or 472 in./min) and discontinuity sizes no greater than 0.5 mm (0.02 in.) equate to a detection rate of 400 Hz. Edge repeatability is critical...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001442
EISBN: 978-1-62708-173-3
... Abstract Hardfacing is a form of surfacing that is applied for the purpose of reducing wear, abrasion, impact, erosion, galling, or cavitation. This article describes the deposition of hardfacing alloys by oxyfuel welding, various arc welding methods, laser welding, and thermal spray processes...
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 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...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005588
EISBN: 978-1-62708-174-0
... elongate more toward the back of the arc for low-conductivity material. For aluminum, a larger heat input would be required to obtain the same weld size as the stainless steel weldment. Abstract The finished product, after fusion welding, may contain physical discontinuities due to excessively rapid...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001365
EISBN: 978-1-62708-173-3
..., force, and pulsation are selected to keep the surface temperature of the weld below the point where metallurgical discontinuities are developed. Diligent maintenance of the wheel condition and the cooling system cannot be overstated for sensitive applications. Empirically, the optimum time for the...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006514
EISBN: 978-1-62708-207-5
... resistance weld than bare alloys, because of the low electrical resistance and high melting point of the cladding at the contacting interfaces. Resistance welding is quite adaptable to a range of discontinuously reinforced aluminum composites. Problems associated with welding these materials typically...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001432
EISBN: 978-1-62708-173-3
... Welding Processes” and the article “Overview of Weld Discontinuities” in this Volume. Shielded metal arc welding is widely used for joining all classes of carbon steels. Detailed information is available in the article “Shielded Metal Arc Welding” in this Volume. A wide variety of electrode types...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003358
EISBN: 978-1-62708-195-5
... atoms per structural unit, is an important reinforcement for use in nuclear containment applications. Boron carbide is more inert in the presence of aluminum at high temperatures than is SiC. Its nonreactivity makes it more suitable for applications involving welding or casting. Fig. 5 Inherent...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001436
EISBN: 978-1-62708-173-3
... the faster welding processes, such as GMAW, to avoid variations in penetration and fusion. For instance, both of these discontinuities can result from the fluctuations in current that occur in the root pass of a groove or fillet weld when manipulating a GMAW gun powered by a constant-voltage machine...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001444
EISBN: 978-1-62708-173-3
... Abstract Electron-beam welding (EBW) can produce deep, narrow, and almost parallel-sided welds with low total heat input and relatively narrow heat-affected zones in a wide variety of common and exotic metals. This article discusses the joint configurations and shrinkage stresses encountered in...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001818
EISBN: 978-1-62708-180-1
... Abstract This article discusses the effect of using unsuitable alloys, metallurgical discontinuities, fabrication practices, and stress raisers on the failure of a pressure vessel. It provides information on pressure vessels made of composite materials and their welding practices. The article...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002367
EISBN: 978-1-62708-193-1
... fatigue weldments THERE IS general agreement that the main factors influencing the fatigue life of a weldment are: Applied stress amplitude Mean and residual stresses Material properties Geometrical stress concentration effects Size and location of welding discontinuities but...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005633
EISBN: 978-1-62708-174-0
... failures that occur in flash welds originate at such discontinuities. These discontinuities normally have little effect on static strength but can measurably reduce fatigue life. Excessive energy input and insufficient upsetting force or travel speed are the most common causes of such inclusions. Fig...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006510
EISBN: 978-1-62708-207-5
... Bhagat R.B. , Laser Processing of Discontinuously Reinforced Aluminum Matrix Composites , The Metal Science of Joining , ASM International , 1992 , p 241 – 247 89. Kawali S.M. , Viegelahn G.L. , and Scheuerman R. , Laser Welding of Alumina Reinforced 6061 Aluminum Alloy...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003232
EISBN: 978-1-62708-199-3
... makes it convenient to apply and remove the yoke from the test piece. Fig. 5 Electromagnetic yoke, showing position and magnetic field to detect discontinuities parallel to a weld bead. Discontinuities across a weld bead can be detected by placing the contact surfaces of the yoke next to and on...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005344
EISBN: 978-1-62708-187-0
... weld shrinkage cracks. Fig. 12 Micrograph of low-alloy steel shrinkage crack. Original magnification: 7.5× “Hot tear” is often associated with shrinkage. In hot tears, rupture occurs through the material that has not fully solidified. These hot spots remain fluid longer, thus serving as a...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001831
EISBN: 978-1-62708-181-8
...) and 13 , respectively. Fig. 12 Examples of cleavage fractures. (a) Twist boundary, cleavage steps, and river patterns in an Fe-0.01C-0.24Mn-0.02Si alloy that was fractured by impact. (b) Tongues (arrows) on the surface of a 30% Cr steel weld metal that fractured by cleavage Fig. 13...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003420
EISBN: 978-1-62708-195-5
... Abstract Metal-matrix composites (MMCs) are a class of materials with a wide variety of structural, wear, and thermal management applications. This article discusses primary processing methods that are used to manufacture discontinuous aluminum MMCs, namely, high-pressure die casting...