UNDERSTANDING POROSITY FORMATION AND PREVENTION WHEN WELDING
Por um escritor misterioso
Last updated 29 março 2025

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.

Shielded Metal Arc Welding (SMAW): Definition, How It Works, and Advantages

Submerged Arc Welding Quality Issues - FABTECH

Porosity formation mechanism and its prevention in laser lap welding for T-joints - ScienceDirect

Keyhole-induced porosity formation during laser welding - ScienceDirect

What is Welding Porosity? Causes, Prevention & Fixes

PDF) Porosity Formation and Prevention in Pulsed Laser Welding

WHY AM I GETTING POROSITY : r/Welding

Porosity in Welding: What is it? And How to Prevent It

UNDERSTANDING POROSITY FORMATION AND PREVENTION WHEN WELDING TITANIUM ALLOYS WITH 1 ?m WAVELENGTH LASER BEAMS
What is the reason of porosity in welding? - Quora

The ABC's of Arc Welding, Education Center

Welding Techniques

Challenges and solutions of reducing porosity formation during remote laser welding of die casting aluminium
Recomendado para você
-
SCP 10000 and 10000-02, Wiki29 março 2025
-
SCP 10000 (The Log Cabin) - SECTION 2: SCP 10000 file - Wattpad29 março 2025
-
SCP-2951 - 10,000 Years from scp 10000 Watch Video29 março 2025
-
PDF) A novel local search for unicost set covering problem using29 março 2025
-
Dawit Abebe, Artist29 março 2025
-
Exploring the SCP Foundation: SCP-2951 - 10,000 Years from scp29 março 2025
-
8 Advanced parallelization - Deep Learning with JAX29 março 2025
-
So it seems Ovdal Lodhum isn't the true hold of love. : r/Anbennar29 março 2025
-
TreasureBox.ke Outer Ring Road29 março 2025
-
RI360P2-QR14-LIU5X2 by TURCK - Buy or Repair at Radwell29 março 2025
você pode gostar
-
Popular IPTV Client Perfect Player Removed from Google Play Store29 março 2025
-
Mark Hamill Has Been In More Star Wars Movies Than You Think29 março 2025
-
Cyberpunk Night City Sci-Fi 4K Wallpaper #6.73829 março 2025
-
Paul Young-Everytime you go away-tradução29 março 2025
-
Sobrevivência na Ilha Jogos de Zumbis versão móvel andróide iOS apk baixar gratuitamente-TapTap29 março 2025
-
Vestido de Luxo Cinderela Infantil 2 a 3 Anos, Roupa Infantil para Menina Propia Nunca Usado 8758895829 março 2025
-
Basquetebol/Angola: Petro de Luanda vence Marinha na segunda mão da Taça de Angola - Basquetebol - SAPO Desporto29 março 2025
-
How to Download Windows 11 X-Lite and Install It on Low-End PCs - MiniTool29 março 2025
-
Patience Guns´n Roses - ESL worksheet by Re_cris29 março 2025
-
Stream Water Island (Full Song) (3.6) With Epic Wubbox! by wind29 março 2025