Download or read book Porosity in Titanium Welds written by Robert Melvin Evans and published by . This book was released on 1964 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Porosity in fusion welds in titanium has been encountered to some extent in all programs using this joining method. While measures to control cleanliness and to employ good welding techniques have successfully reduced the occurrence of porosity, specific indentification of the various causes of porosity is still lacking. Some factors suspected of causing porosity in titanium welds are hydrogen, cleanliness of joint area, contamination in filler wire, and welding procedures and techniques.

Download or read book Porosity in Titanium Welds written by T. H. North and published by . This book was released on 1968 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Understanding Porosity Formation and Prevention when Welding Titanium Alloys with 1 mu m Wavelength Laser Beams written by Jonathan Edward Blackburn and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Keyhole laser welding is a joining technology characterised by the high focussed power density applied to the workpiece, facilitating deep penetration at high processing speeds. High aspect-ratio welds produced using this process invariably have narrow heat-affected-zones and minimal thermal distortion compared with traditional arc welding processes. Furthermore, the ability to process out of vacuum and the easy robotic manipulation of fibre optically delivered 1[mu]m wavelength laser beams, allow keyhole laser welding to process geometrically complex components. The widespread uptake of keyhole laser welding for the production of titanium alloy components in the aerospace industry has been limited by the stringent weld quality requirements. Producing welds with levels of subsurface weld metal porosity content meeting the required weld quality criteria has been the primary obstacle. Here, three techniques for controlling the levels of weld metal porosity when welding titanium alloys with Nd:YAG rod lasers have been developed. Characterisation of the welding processes using high speed photography and optical spectroscopy, have allowed an original scientific understanding of the effects these methods have on the keyhole, melt pool and vapour plume behaviour. Combining this with a thorough assessment of the weld qualities produced, has enabled the effects of these process behaviours on the formation of weld metal porosity to be determined. It was found that with the correct process parameters a directed gas jet and a dual focus laser welding condition can both be used to reduce the occurrence of keyhole collapse during Nd:YAG laser welding. The directed gas jet prevents the formation of a beam attenuating vapour plume and interacts with the molten metal to produce a stable welding condition, whereas the dual focus laser welding condition reduces fluctuations in the process due to an enlarged keyhole. When applied, both techniques reduced the occurrence of porosity in the weld metal of full penetration butt welds produced in titanium alloys. A modulated Nd:YAG laser output, with the correct waveform and modulation frequency, also reduced the occurrence of porosity in the weld metal compared with welds produced with a continuous-wave output. This was a result of an oscillating wave being set-up in the melt pool which manipulated the keyhole geometry and prevented instabilities in the process being established. In addition, the potential for welding titanium alloys to the required weld quality criteria with state-of-the-art Yb-fibre lasers has been assessed. It was found that the high power densities of suitably focussed laser beams with excellent beam quality, were capable of producing low-porosity full penetration butt welds in titanium alloys without the techniques required for laser beams with a lower beam quality. These new techniques for keyhole laser welding of titanium alloys will encourage the uptake of keyhole laser welding for producing near-net-shape high-performance aerospace components. The advantages offered by this joining technology include high productivity, low heat input and easy robotic automation.

Download or read book Porosity Formation in Titanium Welds written by Rahul Shrikant Pathak and published by . This book was released on 1997 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Welding of Titanium and Titanium Alloys written by G. E. Faulkner and published by . This book was released on 1959 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Arc welding Titanium written by Abraham L. Engel and published by . This book was released on 1955 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research and Development for the Welding of Titanium and Titanium Alloys written by J. J. Chyle and published by . This book was released on 1954 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Weld Porosity in Titanium Alloy Sheet written by Seung Chul Chang and published by . This book was released on 1978 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Inert gas shielded Metal arc Welding of Titanium written by E. A. Franco-Ferreira and published by . This book was released on 1959 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sources and Causes of Porosity in Titanium Arc Welds written by Mark M D'Andrea (Jr) and published by . This book was released on 1966 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: An exploratory study was conducted in which theoretical concepts were investigated and established to account for the phenomena of porosity formation in titanium arc welds. Significant and nonsignificant sources of gas evolution and the probable causative gases were determined. The work was limited to a study of the effects of seemingly pertinent material and welding parameters pertaining to single-pass, open-air, inert-gas-shielded consumable electrode (MIG) welding procedures in 1/8-inch-thick Ti-6Al-4V sheet material. The results of the study were deemed applicable in general for arc welds made in titanium plate and other titanium base materials. The important conclusion was that individually molecular hydrogen and oxygen were considered to be definite, independent, causative gases. The following gases were considered not causative: H2O, N2, NsubxOsuby compounds, CO, CO2, A, He, S and P plus their oxides, and CsubxHsuby and CsubxHsubyOsubz compounds. Sources of hydrogen porosity were considered hydrogen-bearing foreign matter on and entrapped in the surface of base material, and hydrogen contained in the base material essentially in the form of titanium hydride. The source of oxygen porosity was considered to be oxygen-bearing scale on the surface of base material The qualitative and somewhat quantitative aspects of sources and causes as well as the mechanisms of gas evolution and entrapment are presented herein. (Author).

Download or read book A Literature Survey of Porosity in Titanium Welds written by and published by . This book was released on 1998 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nitrogen Content and Porosity of Titanium Weld Metal written by T. KOBAYASHI and published by . This book was released on 1969 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Understanding Porosity Formation and Prevention when Welding Titanium Alloys with 1 m Wavelength Laser Beams written by Jonathan Edward Blackburn and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Understanding porosity formation and prevention when welding titanium alloys with 1 m wavelength laser beams written by Jonathan Edward Blackburn and published by . This book was released on 2011 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report on Porosity in Formed Titanium written by R. A. Wood and published by . This book was released on 1957 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Review of Weld Metal Porosity and Hydride Cracking in Titanium and Its Alloys written by L. S. Smith and published by . This book was released on 1998 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tentative Specification for Titanium and Titanium alloy Bare Welding Rods and Electrodes written by American Welding Society and published by . This book was released on 1961 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: