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WO/1993/013905A1 |
In a plasma arc cutting torch (10), a flow of plasma gas is bypassed out of a plasma chamber (14) preferably at an annular gap between a pre-orifice in an inner nozzle piece (36) and an exit nozzle orifice in an outer nozzle piece (38). ...
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WO/1993/013906A1 |
A method of plasma spraying of polymer compositions is disclosed for use with a plasma spray system having a cathode (20) and anode (8) for developing an electric arc in the presence of an ionizable gas, an ionizable plasma gas source fo...
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WO/1993/006702A1 |
A plasma arc torch having new electronic circuit (100) concepts wherein main current regulated power means (116) regulates the pilot current prior to main arc transfer. Further, the circuit may contain two inductors to which DC current i...
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WO/1993/003879A1 |
A system and method are provided for the non-thermal destruction of hazardous waste material using an electrodeless inductively coupled RF plasma torch (30). The waste material (26, 32) is combined with a controllable source of free elec...
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WO/1992/021220A1 |
Plasma treatment apparatus includes means to generate a plasma jet at atmospheric pressure, and means to control both the cross-sectional size of the jet and the relative speed of movement between the jet and a body being treated.
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WO/1992/019412A1 |
A device and a method for welding, which enables high quality welding to be applied to surface-treated metals such as galvanized steel plates while keeping the plates in close contact with each other. At the time of welding, auxiliary ga...
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WO/1992/019086A1 |
A high performance induction plasma torch (1) comprises a cylindrical torch body (2) made of cast ceramic or composite polymer, a coaxial cylindrical plasma confinement tube (9) located inside the torch body (2), a gas distributor head (...
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WO/1992/018282A1 |
A plasma arc torch (10) has a secondary gas flow (46) that is extremely large during piercing of a workpiece (36). The secondary flow (46) exits the torch immediately adjacent the transferred plasma arc (34) and is an extremely uniform, ...
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WO/1992/017310A1 |
Plasma cutting apparatus (10) for use in cutting a material (M). A torch (12) cuts the material. A control unit (14) controls the cutting operation performed by the torch and includes a control module (16) in which the control unit is ho...
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WO/1992/013179A1 |
A nickel-base alloy for use as valve seat material on an exhaust valve for an internal combustion engine comprises, stated in % by weight, 20 to 24 % Cr, 0 to 8 % W, 4 to 7 % Al, 0.2 to 0.55 % C, 0 to 2 % Hf, 0.1 to 1.5 % Nb, 0 to 8 % Mo...
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WO/1992/010325A1 |
A novel, water-cooled plasma torch is described which is particularly suitable for piercing a refractory material. A method using the plasma torch to open a plugged taphole in a furnace wall is also described. The method can be easily au...
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WO/1992/010077A1 |
A gas plasma generating system comprises a resonant cavity (11) for connection to a source (1) of very high frequency power. A plasma cavity (12) defined by an electrically non-conductive material such as ceramic is positioned within the...
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WO/1992/006223A1 |
A cermet material, a composite roll comprising a steel or iron based core and a hardface of the cermet material, and a method of forming a composite roll by plasma arc welding the cermet material onto the core are disclosed. The hardface...
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WO/1992/004133A1 |
A high velocity arc spray apparatus includes a transferred-arc-plasma torch assembly (10) which forms a transferred-arc column. A metal feedstock (122) is fed into the transferred-arc column at an angle such that no portion of the metal ...
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WO/1992/001360A1 |
Parasitic arcs occurring in the operation of plasma burners adversely affect economic running and endanger important parts of the burner. Known couter-measures are successful only to a limited extent. Fitting the annular channel between ...
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WO/1992/000658A1 |
A plasma torch (10) incorporates a plurality of arc forming chambers (14) arranged symmetrically about an axis (16) and each containing a first electrode (18). A common electrode (32) cooperates with the electrode (18) in each chamber (1...
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WO/1991/020176A1 |
A dc power supply (1) for a dc arc torch comprising: a controlled switch (2) and an inductance (3) connected in series, in use, in circuit with a source of direct current and an arc torch (6); a free-wheeling diode (9) connected, in use,...
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WO/1991/017846A1 |
A composite machine tool wherein a punching center and a cutting work position coincide with each other in order not to restrict a moving space of a workpiece at the time of cutting work as well as at the time of punching work. The tool ...
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WO/1991/016170A1 |
A standoff control method and apparatus for a plasma cutting machine, which can quickly correct deviation of standoff from a set value, can keep constant standoff with respect to the change of a cutting speed, does not cause the drop of ...
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WO/1991/016164A1 |
A process and apparatus for reducing wear of an electrode in a plasma arc torch (12) involves altering the gas flow in a plasma chamber (32) surrounding the electrode (22) immediatly before and continuing after cutting of the current tha...
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WO/1991/016166A1 |
A process and apparatus for reducing wear of an electrode in a plasma arc torch (14) involves providing a substantial pressure drop in a flow of plasma gas from the torch to a plasma arc chamber (32) defined by the electrode (22) and a n...
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WO/1991/016165A1 |
A process and apparatus for reducing wear of an electrode in a plasma arc torch involves altering the gas flow in a plasma chamber surrounding the electrode (22) immediately before and continuing after cutting of the current that sustain...
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WO/1991/016169A1 |
A controlling method for maintaining a plasma torch at an optimum height by monitoring changes in cutting speed so as to achieve quality plasma cutting. To this end, a base metal (2) is cut by a plasma arc (3) while a torch (1) is kept a...
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WO/1991/010531A1 |
The method is intended for determining the location of the edge (1a) of a sheet (1) having an uneven surface and placed on the work table of a coordinate machine comprising a carriage (2) with a working instrument (3) mounted on it, and ...
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WO/1991/005629A1 |
A plasma arc torch mounts an electrode (14) and a nozzle (12) with a mutual spacing, symmetrically about a common longitudinal axis (40) at one end of the torch (10) adjacent a workpiece. The inner surface (26) of the nozzle (12) has an ...
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WO/1991/004122A1 |
A quick disconnect connector for both electrical power and gas flow to a plasma arc torch has a plug that includes at least one pin contact and a mating receptacle that includes at least one socket contact that receives the pin contact a...
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WO/1991/002619A1 |
A plasma arc cutting torch (10), particularly one operating in the 0-200 ampere range, has a shield (38) mounted at its lower end adjacent a workpiece (26) to block splattered molten metal (26a) from reaching a nozzle (16) of the torch. ...
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WO/1990/015688A1 |
A device for applying a dross adhesion preventive for plasma cutting, which is suitable for executing piercing start on a workpiece and is adapted to realize unmanned and automated plasma cutting operation. A nozzle (4) for injecting the...
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WO/1990/013392A1 |
In an apparatus for machining by the means of a plasma beam a workpiece made of a material of high softening or melting point, especially quartz, glass or a metal, comprising at least three electrodes (7, 8, 9) connected to a current sup...
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WO/1990/011865A1 |
The invention comprises a power transfer circuit for a plasma torch for smoothly and linearly transferring the plasma arc from the nozzle (42) of the torch to a workpiece (36) as cutting commences and vice versa as cutting is completed. ...
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WO/1990/009860A1 |
This invention relates to a method and apparatus for plasma cutting for practicing a piercing start for a material to be cut. In order to practice a piercing start excellently and secure a high quality of a cut product in this method, th...
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WO/1990/007395A1 |
This invention relates to a transferred plasma-arc torch capable of giving a favorably cut surface having a small angle of inclination even when a thick plate is cut. The torch has a nozzle (1) surrounding the tip of an electrode holder ...
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WO/1990/006207A1 |
A method of lining an exhaust manifold (10, 11) is disclosed applying a thin layer of heat-resistant compound (16, 17) to the interior of an exhaust manifold (10, 11) and bonding the compound (16, 17) to the manifold. The manifold (10, 1...
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WO/1990/004485A1 |
A plasmatron comprises a casing (1) with a removable head (2), both being provided with channels (4, 5) for inlet and outlet of a cooling agent and an electromagnetic valve (8) whose movable element consists of a rod (9) with as many thr...
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WO/1990/004482A1 |
A method for optoelectronic control of oxygen cutting provides for capturing the flame radiation of the cutter (12) before the beginning of metal cutting and evaluating the intensity of said flame (12); capturing the radiation of the met...
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WO/1990/004486A1 |
Improvements in a method of working a plate in a plasma cutting machine which cuts materials using a stable plasma arc, and in a plasma torch. That is, the working method in which the magnetic flux is focused at a density of greater than...
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WO/1990/004484A1 |
A method for checking the working capacity of a plasmatron electrode consists in measuring the plasma arc acoustic radiation frequency and considering the electrode to have no working capacity at a nominal value of the operating current ...
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WO/1990/003243A1 |
In a plasma arc torch, an electrode (22) is movable axially into and out of electrical connection with an anode (20), typically a nozzle secured to one end of a torch body (12). A flow (26c) of pressurized plasma gas is directed to a pla...
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WO/1990/003095A1 |
An electric arc generating device including, a first electrode (1) and at least two further electrodes (2, 3, 4). A source of electrical power (11) is connectable to said electrodes so as to cause an arc to burn between the first electro...
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WO/1989/011941A1 |
A plasma arc cutting torch, particularly one operating in the 0-200 ampere range, has a shield (38) mounted at its lower end adjacent a workpiece (26) to block splattered molten metal from reaching a nozzle (16) of the torch. The shield ...
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WO/1989/009110A1 |
A plasma-arc cutting machine and a method of controlling the same, wherein a rise compensation circuit (39) and a transfer compensation circuit (44) consisting of a charge/discharge capacitor and a resistor are inserted in parallel betwe...
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WO/1989/001281A1 |
A cathode structure of a transfer-type plasma torch which is so designed as to enhance the cooling effect and to decrease the wear of the cathode member by constantly moving the point of electric discharge on a plane at the lower end of ...
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WO/1988/005704A1 |
An arc plasma torch (10) includes a moveable cathode (14) and a fixed anode (16) which are automatically separated by the buildup of gas pressure within the torch after a current flow is established between the cathode (14) and the anode...
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WO/1988/001218A1 |
The device comprises a cathode unit (1) with a casing (3) and with an electrode (6) provided with a conical portion (19), and an anode unit (2) with a casing (20) and with a nozzle (12) in which is situated the conical portion (19) of th...
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WO/1988/001126A1 |
An electrode structure of a non-transfer-type plasma torch which exhibits small-current and high-tension operation characteristics, which heightens the plasma jet energy efficiency, which lengthens the electrode life, and which produces ...
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WO/1987/007862A1 |
Apparatus (10) generating a laser sustained plasma torch includes a laser (12), producing laser radiation (14) which is focused to a focal region (17) at least partially within a plasma torch nozzle means (24). The plasma torch nozzle me...
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WO/1986/007553A1 |
The fabrication method enables to obtain metal envelopes intended to contain products enabling to elaborate gas purifiers. The method involves a preparation of particular machinings of the extremities of the metal envelope (1) and weldin...
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WO/1984/004065A1 |
A rotary electrode apparatus (10) for producing metal powders including: a chamber (14) for maintaining a controlled atmosphere that contains a first electrode (30) mounted for translational and rotational movement, a second electrode (4...
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WO/1984/002296A1 |
Improvement in a laser machining apparatus using, in combination, a machining laser oscillator (101) and a device (110) for supplying auxiliary energy such as a plasma. The invention is characterized in that the auxiliary energy generate...
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WO/1981/002430A1 |
The method provides for placing a plane workpiece (1) in its initial position horizontally between cooled beams (2 and 3) of a crystallizer. Plasma-arc burners (6) are placed in a row above the workpiece (1) and across its parallel edges...
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