Abstract: A system to prevent a dangerous contact voltage in a welding apparatus by providing a protective device for cutting off the power for welding. The welding system has a power source including a primary circuit and a secondary circuit. An electrode receiving the power welds workpieces which are successively inserted and removed into electrical contact in the welding system. A protective ground is provided between the housing for the power source and ground. To prevent dangerous grounding during the welding operation, there is connected between the workpiece lead in the secondary and the housing a device which monitors both the current to the protective wire ground and the voltage between the workpiece lead and the housing. This monitor device controls a power cut-off switch. The current is monitored through a current sensor which is connected to the monitor device and the current sensor is also connected in series between the housing and the protective ground.

Abstract: A device for cutting a continuously cast strip conveyed on a roller bed includes a cutting machine having at least one flame cutting unit. A control unit controls the transverse movement of the flame cutting units in such a way that the flame cutting units are always between individual rollers during the cutting operation.

Abstract: A gas transport laser has several discharge sections through which the laser gas flows and is attached on mounts. The mounts have borings for connection of the discharge tube sections, as well as for the intake and discharge in such a manner that the discharge tube sections, the gas supply and the gas discharge are parallel to each other.

Abstract: A procedure for cooling work pieces includes mixing solid matter in the form of microscopic particles with a low boiling liquefied gas wherein the particles are suspended therein due to their specific weight or by the turbulence in the gas.

Abstract: An instrument for maintaining a constant distance between a tool, such as a cutting torch, and a workpiece includes a sensing electrode connected to two different phase control system-building blocks one of which functions as an oscillator having its output connected to the input of the other phase control system-building block.

Abstract: A plastically deformable cooling agent consists of a mixture of liquid nitrogen with at least 8% by weight of fine-grained silica gel.

Abstract: Powder, such as metallic powder for marking workpieces, consists of a blend of fine powder and of coarse powder.

Abstract: Food is packaged under a protective gas in synthetic containers having flexible lids. The sequence of the packaging steps is product filling, lid application, flushing with a protective gas, and sealing the lid. The flushing takes place wherein the lid is affixed to the container edge at at least one location, while one side of the lid is slightly lifted so that the protective gas can be blown therein.

Abstract: During the flame cutting of a workpiece, a slag bead is produced and is removed by a scarfing burner directed only towards the cut surface of the workpiece.

Abstract: Samples of materials, such as biological materials, are stored in liquid nitrogen in containers arranged as sliding sleeves wherein the outer sleeve is longer than the inner sleeve and has an apertured protruding edge so that a sealed wire can be threaded therethrough.

Abstract: A hollow synthetic profile is cooled during extrusion by direct heat exchange through the introduction of under-cooled liquid nitrogen under a pressure of 2 to 8 bar into the hollow interior by means of a boring in the arbor of the extrusion tool with an insulated capillary tube forming the cooling medium line.

Abstract: A device for moving a welding torch during the welding of seams, particularly circumferential seams, includes a chassis driven by a feed motor with a feed motor control unit and includes a decelerating/accelerating device for the feed motor.

Abstract: A process for the preparation of pre-melted, basic welding powder for the submerged arc welding process which consists of preparing two components, one component containing substantially oxidic compounds and maximally 5% by weight of fluoridic compounds, and the other component containing substantially fluoridic compounds and maximally 5% by weight of oxidic compounds, with the total of oxidic and fluoridic compounds corresponding to the desired analytical composition of the powder. Each of the two compounds are melted separately and, the premelted components are cooled. The cooled product is then ground to the desired grain size and thereafter mixed. The welding powders according to the invention are distinguished by a particularly low moisture content.

Abstract: A system for sealing the working vacuum chamber of a charged particle beam machine which is movable with respect to a workpiece is disclosed. The system includes a housing with a central compartment having wire-shaped elements urged against the workpiece to provide a seal therebetween, and lateral compartments, each having a packing of sealing material which is biased against the workpiece surface of a spring arrangement. Rollers and a flexible lip seal arrangement having a flexible sheath of synthetic rubber are also disclosed.

Abstract: A device for cooling a gas to below its dew point by heat exchange with a low-boiling gas includes a double-walled cooling pipe with an annular space between the walls having an inlet for the low-boiling liquefied gas and a drain pipe for the evaporated gas, with at least one blow-in opening for the low-boiling liquefield gas being in the zone of the intake opening of the cooling pipe; a movable ice scraper is arranged at the intake opening and is periodically movable over the blow-in opening for the low-boiling liquefied gas.

Abstract: A control circuit for measuring the distance between a workpiece and an electrode which is formed as inductance and is part of a resonant circuit as a frequency-determining element whereby the frequency variations of the resonant circuit for producing voltage and/or current changes which are proportional to a distance are connected to a measuring circuit and includes at least two partial inductances in the resonant circuit with one inductance being represented by the electrode and the other being a stationary resonant circuit arranged at a distance from the electrode and in the immediate influence sphere of the workpiece.

Abstract: A scarfing device includes a powder supply apparatus having a plurality of discharge nozzles controlled by a shutoff valve and includes at least one extra scarfing nozzle associated with one of the powder discharge nozzles.

Abstract: A scarfing torch includes upper and lower preheating blocks spaced apart to form a scarfing oxygen channel and having a powder supply consisting of a nozzle provided in one of the preheating blocks.

Abstract: A burner head for a fuel-oxygen burner includes a first chamber connected at one end with the oxygen intake and at the other end with a second chamber by means of a nozzle and includes a pipe located in the fuel intake and opening into the first chamber.

Abstract: A flame cutting machine control system has a housing to hold the control units with a front plate for the housing; the control units are attached to the front plate with the front plate being designed as a housing cover and the control units being insertable into the housing.