Wilden J.,TU Berlin |
Jahn S.,TU Berlin |
Melahin N.,TU Berlin |
Rehfeldt L.,TU Berlin |
And 4 more authors.
Welding and Cutting | Year: 2010
Compared with welding technology, the utilisation of brazing processes for joining reduces the process temperatures and makes it possible to execute demanding mixed joints and to join galvanised steels with minimal damage to the zinc coat. The latest developments of brazing materials are aimed at lowering the melting temperatures and at raising the strengths in order to extend the application possibilities even further. In this respect, not only iron-based alloys but also systems on a copper or zinc basis are subject to constant refinement. The strengths which can already be achieved today extend up to approx. 900 MPa (CuAl8Mn13Ni2Fe2) with copper-based alloys and 410 MPa (AnAl7.5Cu2.5 + 180 ppm Mg) with zinc alloys. In addition to saving energy due to the reduced process temperatures during joining and to the possibility of manufacturing hybrid structures, there are advantages with regard to the repair and recycling of components. Since the filler material can be remelted completely independently of the base material, repairs are easier and the components can also be separated for recycling. When considering the entire product life cycle, this leads to a higher energy efficiency and to the conservation of natural raw materials and resources. Due to the rising energy and material costs and to the cost pressure association with this, the companies are slowly but surely paying greater attention to this aspect in addition to feasibility and productivity. Moreover, cost advantages result from the consideration and modification of whole fabrication chains. Lowmelting filler materials permit, for example, the joining of galvanised semi-finished products without damaging the zinc coat. Since large quantities of semi-finished products can be galvanised at more favourable cost than finished structures, the joining of galvanised semi-finished products is, all in all, more favourable than the galvanisation of welded steel structures.
Evidence of short arc welding for magnesium alloys and solutions to stimulate the reproducibility of the process [Prove di saldatura ad arco in short are di leghe di magnesio e soluzioni per incentivare la riproducibilità del processo]
Bergmann J.P.,TU Ilmenau |
Petzoldt F.,TU Ilmenau |
Schricker K.,TU Ilmenau |
Gunther K.,TU Ilmenau |
Hubner M.,EWM GmbH
Rivista Italiana della Saldatura | Year: 2013
The adoption of magnesium and magnesium alloys is an interesting option for lightening the car body in the automotive field. The weldability of magnesium is affected by the low melting temperature and the reduced range between melting and boiling temperature. In case of excessive heat input, the magnesium begins to boil, generating gas porosity and spattering. GMAW short arc welding fine tuned allows the heat input reduction, even if the poor wettability due to the high cooling speed at the weld start promotes lack of fusion and other imperfections. In this article the GMAW short arc optimized for magnesium alloys is described. More in detail, the focus is in the heat input control, with the target of establishing the process limits and proposing solutions for increasing the wettability, specially at the weld start, close to the fusion line.
EWM GmbH | Date: 2009-09-08
Metalworking machines, namely, production machines for mowing equipment; woodworking machines, namely, communal mowers, communal cutters; machines for the working of plastics, namely, production machines for mowing equipment; machines for agriculture, namely, mowers, combines, harvesters and reapers; tractor towed implements, namely, mowers, harvesters and combines, harvesters and reapers; tractor towed implements, namely, mowers, harvesters and reapers; mowing machines; attachments for agricultural machinery, namely, mowing attachments; packing machines; replacement parts of the aforesaid machines; machine parts, namely, mowing assemblies, drive gears and drive transmissions for mowing assemblies and mowing cutters, cutters and blades, mowing cutters, crop lifters, guides for mowing assemblies; machine tools, namely, metal working machine tools; transmission components and replacement parts therefor, except for land vehicles; gear boxes and transmissions, except for land vehicles; gearboxes and transmissions for mowing assemblies and mowing cutters. Land vehicle transmissions and replacement parts therefor; transmission components for land vehicles, namely, pulleys belt pulleys and drive shafts; gear boxes for land vehicles; gear box linkages for land vehicles.
EWM GmbH | Date: 2012-08-21
Machines, namely, soldering and welding and cutting machines; accessories for soldering and welding machines and cutting machines, namely, for conveyors and electrically operated suction tables and tables specially adapted to hold powered machinery for monitoring and adjusting work-pieces produced by soldering and welding machines and cooling modules for soldering and welding machines; automated filler wire feed devices, namely, an electric welding wire feeder for soldering and welding machines; cutting torches; electric arc welding torches. Electric soldering and welding apparatus, arc-soldering and arc-welding apparatus and accessories therefor, namely, an electric welding power source consisting of a transformer, electrical current redressers, and electronic controls for controlling the electric current used for welding and for selecting welding parameters, namely, electric current, tension, and welding method, electrodes, and remote controls; welding torches. Soldering and welding.
EWM GmbH | Date: 2012-07-17
Industrial safety cabins made of metal; wire made of metal, namely, filler wire; metal solder; metallic powder, namely, welding powder; soldering rods made of metal for braze soldering. Industrial robots; electric soldering and welding machines; machines incorporating lasers for welding, soldering and cutting; electric welding machines for orbital welding; cleaning machines for cleaning metallic materials, namely, for cleaning weldment joints; machines and machine tools for marking metallic materials; machines and machine tools for stripping and for rendering passive metallic materials, in particular weldment joints; grinding machines for grinding welding electrodes; electric plasma cutters; plasma welding machines; electric resistance welding machines for use in resistance spot welding and stud welding; suction machines for welding fumes; gas-operated metal cutting machines; gas welding machines; machines incorporating gas warming devices for warming metal prior to welding; electric power tools for metalworking, namely, right angle grinders and burr grinders; metal cutting and processing machines, namely, drilling machines, electric hammers, polishing hammers, die-stamping machines, machine saws, power grinders, and machine tools for bevel edge forming; apparatus for applying forming gas, being part of welding machines; electrically operated suction tables for industrial use; cutting tables being part of metalworking machines. Manually operated tools for metalworking, namely, pliers, cutting tools, abrading tools, mortise chisels, scissors, hammers, saws, pipe cutters and wrenches, and tube saws. Laser welding devices and laser soldering devices; electrical soldering and welding torches; electrical soldering and welding torches with inert gas; solar modules for generation of electric current; computer programs for the control of welding apparatus, industrial robots, welding machines and solar electricity machines; measuring and testing devices for measuring the physical properties and proper function of soldering and blow torches, welding apparatus and solar electricity machines; electrical soldering machines; electrical welding machines; electrical machines for orbital welding; opto-electronic protective masks for welding; testing and measuring instruments for welding technology, namely, instruments for measuring delta ferrite and instruments for measuring the remaining oxygen; parts of electrical welding apparatus, namely, grippers and brushes; conventional protective masks for welders; Apparatus for use with gas-shielded electric arc welders, namely, forming gas apparatus for the protection of weldment joints; electrical inert gas shielded arc welding torches; Protective clothing, namely, flame retarding jackets, trousers, coats, and work shoes, protective clothing made of leather; solar collectors for generation of electric current; electrical transformers; storage apparatus for electricity, namely, batteries and capacitors; Welding electrodes, namely, stick electrodes, stick welding electrodes for tungsten inert gas (TIG) welding, solid wire welding electrodes, cored wire electrodes; automatic control apparatus for industrial robots. Fire curtains, namely, protection and safety curtains made from non-inflammable and flame resistant materials for mobile and stationary use. Industrial work tables not being parts of machines and not being specially adapted to hold powered machinery. Rental of welding and soldering devices and machines together with accessories therefor. Organization and conducting of seminars and training courses for basic and advanced training in the area of welding and soldering technology, in particular in relation to industrial automation. Technical consulting in relation to the development of power sources, welding apparatus and machines, and solar power devices; development and rental of computer software, in particular for welding apparatus, industrial robots and solar power devices; development of new technology for others in the field of welding and soldering methods, and in the field of welding and soldering of materials for such methods; rental of measuring and testing apparatus for welding and metalworking technology.