The arc welding department is equipped with a representative selection of welding power sources and machines for GMA welding, TIG and. Welding and related methods bring about the development of respirable fumes and gases. Since these substances may be detrimental to. The book “Fundamentals of joining technology – welding, brazing and adhesive bonding” offers an introduction to this technology. Together.

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Arc Welding – RWTH AACHEN UNIVERSITY Welding and Joining Institute – English

Examples of Weld Pool Backups When welding circumferential tubes, the inclination angle of the electrode has a direct Figure 3. A second, separate power source feeds the transferred arc between electrode and workpiece. Thus, the exact exposition conditions, individual duration and strength are difficult to determine.

Some alloying elements form high-melting oxides which impair the slag expulsion and influence the The material has to fulfill the following requirements: The voltage drops slowly while the arc shortens. The indusCO2 lasers are, nowadays, laser beam trial standard powers for active laser medium approximately 5 – 20 kW, lasers with powers of up to 40 kW are available.

They also know weldibg basic behaviour of steel during welding and hava a basic knowledge of the design of welded constructions.

ISF Aachen Welding Technology Part I

Dependent on the welding task different force and current programs can be set in the welding machines, Figure 8. Afterwards the movement program is supplemented by additional information about e.

A welding flux with the mean characteristic and when a wire base metal slag welding data dilution electrode S3 is used, has a neutral point where neither pickup nor burn-off occur. Surfacing and Shape Welding In contrast to powder flame spraying, is for flame powder injector back frame isolation ring gas middle distributor frame spraying a wire filler metal anode carrier fed mechanically into the copper anode centre cone, melted, atomised and accelerated in direction of the substrate, jet of particles cooling water plasma gas cooling water tungsten cathode Figure At the end of the weld, the switch-off phase is initiated in the run-off plate.


Manufacture of the granulate is finished on a consolidate. By varying the on-off period, i. Surfacing and Shape Welding In the case of the strip-electrode submerged-arc surfacing process normally strips widths: The content limits of the alloying constituents are therefore only Maximum allowable contents of alloy-elements: Pins, rollers, balls, or similar devices may be multilayer seam with ball-probe used as sensors.

This method is not applied frequently and is mainly used for materials which show strong differences in their melting and oxidation behaviours.

This process is frequently subject to automation.

The effect of this is such that after leaving the contact piece the deformed wire creates a spiral diameter of 2. The specially designed torches follow the copper shoes along the weld seam.

ISF – Welding and Joining Institute RWTH Aachen

Resistance Spot- Resistance Projection- and Resistance Seam Welding An example shows the macrosection of a weld nugget after the welding time has ended. Thermal Cutting The high-speed cutting nozzle cutting-oxygen pressure 8 bar allows higher cutting speeds with increased cutting-oxygen pressure.

It shows hardfacing with cobalt which is high-temperature and hot gas corrosion resistant. During water granulation the melt hardens to form small grains with a diameter of approximately 5 mm. By the increase of the welding speed, the dwell times of weld- designation: The shielding gas used in plasma arc welding exerts, due to its thermal conductivity, a deci- plasma torch sive influence onto the arc configuration.


The current is transferred to the wire electrode over the contact tube. The advantage of the weelding of oxygen as plasma gas is in the achievable cutting speeds within the plate thickness range of approx.

ISF Aachen Welding Technology Part I – Free Download PDF

Production processes 4 Joining 4. This generates electromagnetic forces which bring about the detachment of the liquid electrode material.

This factor mainly depends on the – the laser beam is focused on the workpiece surface and the material burns in the oxygen jet starting from the heated surface wave length of the used laser materials: The plasma arc, in comparison, burns highly concentrated with almost parallel flanks, Figure 4.

At present, the development of diode lasers is so far advanced resonator that their sporadic use in the energy source field of material processing is also possible. A transmitter coil generates an magnetically alternating field which induces alternating currents in the two receiver coils. Cost Comparison of Cutting Processes Figure