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Prospects of laser welding technology in the automotive industry: A review

An extended structure zone diagram is proposed that includes energetic deposition, characterized by a large flux of ions typical for deposition by filtered cathodic arcs and high power impulse magnetron sputtering. The axes are comprised of a generalized homologous temperature, the normalized kinetic energy flux, and the net film thickness, which can be negative due to ion etching. It is stressed that the number of primary physical parameters affecting growth by far exceeds the number of available axes in such a diagram and therefore it can only provide an approximate and simplified illustration of the growth condition?structure relationships.

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A structure zone diagram including plasma based deposition and ion etching - eScholarship

Rotary ultrasonic machining (RUM) is a mechanical type of nontraditional hybrid machining process that has been utilized potentially to machine a wide range of latest and difficult-to-machine materials, including ductile, hard and brittle, ceramics, composites, etc. In RUM, the basic material removal phenomenon of ultrasonic machining (USM) and conventional diamond grinding amalgamates together and results in higher material removal rate (MRR), improved hole accuracy with superior surface finish. In the current article, several investigations carried out in the domain of RUM for enormous materials have been critically reviewed and reported. It also highlights several experimental and theoretical ensues of RUM to improve the process outcomes and it is reported that process performance can be substantially improved by making the right selection of machine, diamond tooling, material and operating parameters. In recent years, various investigators have explored umpteen ways to enhance the RUM process performa...

Rotary Ultrasonic Machining: A Review

Introduction Electron beam welding is a fusion welding process and can be used for welding a wide variety of metals, such as stainless steel, Inconel, copper and other variations of their grades. The metal thicknesses range from foils to thick metals sheets. In addition, two different metals or alloys can be welded together. E-beam welding has a vast variety of applications such as; electronics and packaging, automotive and aircraft industry, and in medical technology. In particular, down-hole tools for the oil and gas industry can be processed.

Electron Beam Welding

Toughness enhancement in highly NbN-alloyed Ti-Al-N hard coatings

Disk laser weld brazing of dissimilar metals was carried out. Aluminum alloy 5083 and commercially pure titanium Grade 2 with the thickness of 2.0 mm were used as experimental materials. Butt weld brazed joints were produced under different welding parameters. The 5087 aluminum alloy filler wire with a diameter of 1.2 mm was used for joining dissimilar metals. The elimination of weld metal cracking was attained by offsetting the laser beam. When the offset was 0 mm, the intermixing of both metals was too high, thus producing higher amount of intermetallic compounds (IMCs). Higher amount of IMCs resulted in poorer mechanical properties of produced joints. Grain refinement in the fusion zone occurred especially due to the high cooling rates during laser beam joining. Reactions at the interface varied in the dependence of its location. Continuous thin IMC layer was observed directly at the titanium–weld metal interface. Microhardness of an IMC island in the weld metal reached up to 452.2 HV0.1. The XRD analysis confirmed the presence of tetragonal Al3Ti intermetallic compound. The highest tensile strength was recorded in the case when the laser beam offset of 300 μm from the joint centerline toward aluminum alloy was utilized.

Disk Laser Weld Brazing of AW5083 Aluminum Alloy with Titanium Grade 2

Microstructure and properties of M2 high-speed steel cast by the gravity and vacuum investment casting

Cutting edge preparation of cutting tools using plasma discharges in electrolyte

The paper deals with the evaluation of the shielding gas influence on the properties of AW 5083 aluminum alloy weld joints produced with disk laser. Butt weld joints were produced under different shielding gas types, namely Ar, He, Ar + 5 vol.% He, Ar + 30 vol.% He and without shielding weld pool. Light and electron microscopy, computed tomography, microhardness measurements and tensile testing were used for evaluation of weld joint properties. He-shielded weld joints were the narrowest ones. On the other hand, Ar-shielded weld joints exhibited largest weld width. The choice of shielding gas had significant influence on the porosity level of welds. The lowest porosity was observed in weld joint produced in Ar with the addition of 5 vol.% He shielding atmosphere (only 0.03%), while the highest level of porosity was detected in weld joint produced in pure He (0.24%). Except unshielded aluminum alloy weld joint, the lowest tensile strength was recorded in He-shielded weld joints. On the contrary, the highest average microhardness was measured in He-shielded weld joints.

Martin Sahul

Papers

Toughness enhancement in highly NbN-alloyed Ti-Al-N hard coatings

Disk Laser Weld Brazing of AW5083 Aluminum Alloy with Titanium Grade 2

Microstructure and properties of M2 high-speed steel cast by the gravity and vacuum investment casting

Cutting edge preparation of cutting tools using plasma discharges in electrolyte

Effect of Shielding Gas on the Properties of AW 5083 Aluminum Alloy Laser Weld Joints