UNDERSTANDING POROSITY FORMATION AND PREVENTION WHEN WELDING
Por um escritor misterioso
Last updated 06 julho 2024
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?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.
Gas metal arc welding - Wikipedia
Formation Mechanisms and Preventive Procedures of Laser Welding Defects
UNDERSTANDING POROSITY FORMATION AND PREVENTION WHEN WELDING TITANIUM ALLOYS WITH 1 ?m WAVELENGTH LASER BEAMS
The Importance of Quality Shielding Gas
Metals, Free Full-Text
PDF) Porosity Formation and Prevention in Pulsed Laser Welding
How to Identify the 7 Most Dangerous Welding Defects
Welding Techniques
Keyhole-induced porosity formation during laser welding - ScienceDirect
MMA Welding Quality: Understanding Common Problems - Welding & Welder
Weld Porosity
Area-percent porosity produced in laser welds of AM60B alloy at several
Weld porosity, herringbone, wormhole, crater pipe – AMARINE
Reduced hot cracking susceptibility by controlling the fusion ratio in laser welding of dissimilar Al alloys joints, Journal of Materials Research
24: A review porosity in aluminum welding
Recomendado para você
-
SCP-10,000 b-infinity is a keter it can destroy the planets in a06 julho 2024
-
SCP 10000 (The Log Cabin) - SECTION 2: SCP 10000 file - Wattpad06 julho 2024
-
What a trade : r/SipsTea06 julho 2024
-
Anker PowerCore Select 10000 2-Port Portable Charger Black06 julho 2024
-
MP28163 Datasheet by Monolithic Power Systems Inc.06 julho 2024
-
AORUS Introduces AORUS P1200W 80+ Platinum Power Supply With06 julho 2024
-
PDF) A novel local search for unicost set covering problem using06 julho 2024
-
Offers February 2013 Powerstorm06 julho 2024
-
SolTemplar Nick (@NklausSOL) / X06 julho 2024
-
PDF06 julho 2024
você pode gostar
-
paloma querida me encontrastes|Pesquisa do TikTok06 julho 2024
-
Klace Husky on X: Hope you're ready for more furry Steam backgrounds! These are gonna launch with Winds of Change Early Access soon. / X06 julho 2024
-
Applied and experimental bacterial vaccines. Today, established06 julho 2024
-
Riot Games launches royalty-free album of lo-fi tunes for gamers06 julho 2024
-
New Oakley Flaked Sunglasses06 julho 2024
-
DMC5: Bury the Light EPIC CINEMATIC VERSION「I Am the Storm That06 julho 2024
-
State of Decay 2 confirmed with big new trailer06 julho 2024
-
Famosos - Confira agora os detalhes revelados por Zilu sobre essa06 julho 2024
-
Mewtwo EX 98/99 Next Destinies Gold Foil FanArt Pokemon Card HP 17006 julho 2024
-
Loja à venda e para locação, Morumbi, São Paulo, SP - Shopping Bonnaire Mall - Loja térrea do empreendimento Bonnaire Mall para comércio - Vieira Imóveis06 julho 2024