Abstract:
A method and apparatus for welding together two silicon workpieces (20, 22) without the formation of cracks along the weld. In a first embodiment, current (34, 36) is passed through one or both of the workpieces to heat them to between 600 and 900 DEG C. Then an electric, laser, or plasma welder (38, 40) passes along the seam (24) between the workpieces to weld them together. In a second embodiment, current (34) is passed through a plate (60), preferably formed of silicon, which either supports the workpieces or is brought into contact with at least one of them, whereby the workpieces are preheated prior to the welding operation.
Abstract:
The invention relates to a method for connecting metallic objects, according to which a first metallic object with a low melting point, (referred to hereafter as part A (27)), is connected to a second metallic object with a higher melting point (referred to hereafter as part S (28)). Part A (27) is partially or completely melted in a connecting zone (29), using a heat application process, whereas part S (28), in particular one surface (30) of part S (28), is only slightly melted or not melted at all in said connecting zone (29).
Abstract:
This invention is directed to a metal inert gas brazing power source having a concentric type transformer and an inductor. Each of the transformer and inductor has a magnetic core and a coil having specific characteristics. the transformer has a silicon content and the inductor has a magnetic core having carbon, manganese and silicon.
Abstract:
Weld metals suitable for joining high strength, low alloy steels are provided. These weld metals have microstructures of acicular ferrite (16') interspersed in a hard constituent (11'), such as lath martensite, yield strengths of at least about 690 MPa (100ksi), and DBTTs lower than about -50 DEG C (-58 DEG F) as measured by a Charpy energy versus temperature curve. These weld metals include about 0.04 wt% to about 0.08 wt% carbon; about 1.0 wt% to about 2.0 wt% manganese; about 0.2 wt% to about 0.7 wt% silicon; about 0.30 wt% to 0.80 wt% molybdenum; about 2.3 wt% to about 3.5 wt% nickel; about 0.0175 wt% to about 0.0400 wt% oxygen, and at least one additive selected from the group consisting of (i) up to about 0.04 wt% zirconium, and (ii) up to about 0.02 wt% titanium.
Abstract:
A device (10) for isolating a surface for welding in an underwater location or in high fire risk areas. The device comprises a housing (27) which is arranged to be mounted on the surface and a sealing means (30) to provide a seal between the housing and the surface. The housing (27) is provided with a sealed inlet (50) for receiving a welding apparatus, a fluid inlet (32) for the passage of gas into the housing, and a fluid outlet (34) for the passage of gas and/or liquid out of the housing. A heating means (fig 3 is not figure) for providing heated gas to the fluid inlet is also provided. In use, an ingress of heated gas through the fluid inlet (32) facilitates an egress of gas and/or liquid, contained in a space defined by the housing and the surface, through the fluid outlet (34) in the housing. In this way an in situ dry gaseous environment is provided for welding the surface. The heating means (100) is provided upstream and comprises a space with heating elements (120) surrounded by insulation (130) with electrical inlets (122).
Abstract:
A high offset dual vehicle wheel assembly includes a pair of full face wheels (20, 20) each defining an axis and including a wheel rim and a full face wheel disc. The rim includes an inboard tire bead seat retaining flange, an inboard tire bead seat, a generally axially extending well, and an outboard tire bead seat surface. The disc (42) includes a centrally located wheel mounting flange and an outer annular portion which defines an outboard tire bead seat retaining flange of the vehicle wheel and is located wholly outside a plane defined by the inboard tire bead seat retaining flange. The inboard tire bead seat (38) is provided with a radially in-turned flange having a generally radially inwardly sloping surface, a generally radially extending surface, and an axially extending surface. When the in-turned flange of the rim is positioned against an adjacent inner surface of the disc, a recess is formed between the inwardly sloping surface of the in-turned flange and the inner surface of disc, and a welding area is formed between the axially extending surface of the in-turned flange and the inner surface of disc. The recess (58) defines a groove for receiving a first weld (60), and the welding area defines an area for receiving a second weld (62). The welds cooperate to join the rim (30) and disc together and produce the full face vehicle wheel.
Abstract:
A plasma arc torch has a cathode and electrode having connecting ends configured for a coaxial telescoping connection with one another on a central longitudinal axis of the torch. The connecting ends have interengageable detents thereon, with at least one of the detents being movable in a generally radial direction relative to the central longitudinal axis of the torch between an undeflected state and a deflected state. The at least one detent is movable from the undeflected state to the deflected state when the cathode and electrode are telescoped one into the other, and is movable from the deflected state back toward the undeflected state when the cathode and electrode are further telescoped to a point where the detents on the cathode and electrode are generally axially aligned. In this position, the at least one detent is engageable with the other detent to interconnect the cathode and electrode and inhibit axial movement of the electrode away from the cathode.
Abstract:
There is provided a method of applying a weld overlay to a surface of a wastage susceptible chamber. The basic steps of the method include evaluating the post weld orientation of the surface of the wastage susceptible chamber resulting from the movement of the surface in response to the application of a weld overlay thereon and selecting characteristics of a weld overlay to be applied to the surface of the wastage susceptible chamber based upon the step of evaluating the post weld orientation of the surface of the wastage susceptible chamber. The basic steps of the method also include determining a series of weld torch engagement locations relative to the surface of the wastage susceptible chamber at which a weld torch (30) is to be located for performing thereat welding operations which result in a weld overlay on the surface having characteristics corresponding to the predetermined weld overlay characteristics. A further basic step of the method includes positioning a weld torch (30) at the weld torch engagement locations and controlling the weld torch (30) to produce welds (100, 102) on the surface of the wastage susceptible chamber resulting in the weld overlay having characteristics corresponding to the predetermined weld overlay characteristics.
Abstract:
The invention relates to a method for producing a device for storing solids, liquids and/or gases, especially a container (1) for storing food. According to said method, a strip (10) is deformed in a spiral shape, whereby a lateral surface (2) of the device is formed. The longitudinal edges (24, 26) of the strip (10) are bent along a bending line so as to form an edge and the adjacent longitudinal edges (24, 26) are interconnected. The inventive method is characterised in that a recess (16) is made in the strip (10) along the bending line before it is bent to form the edge. The invention also relates to a device for carrying out this method, comprising a bending station followed by a connecting station (46). The device is characterised in that a recess (16) can be made in the strip (10) at the bending station (38), along the bending line, using a machining tool (12, 14) that is located in front of the bending tool (42a, 42b) for forming the edge.
Abstract:
An apparatus for underwater welding has a housing (34) and a diverter (36). The diverter (36) is inside the housing (34) and has an outer sheath (38) and an inner sheath (40). A gap (48) between the housing (34) and diverter (36) passes a screening fluid (50) to form an outer screening jet that prevents water from flowing into a weld site (52) near the electrode (16). The inner sheath (40) forms a pair of channels (56, 58) in the inner diverter (36). One channel (56) passes a shielding fluid (62) that shields the weld site (52). The other channel (58) forms an exhaust line for venting the weld site (52) during welding.