A method of forming an assembly in which a metal extension element is connected with a metal stub element, by an intermediate element. The intermediate element extends between first and second ends. The intermediate element is positioned to locate its first end spaced apart from the stub element. An inner end of the extension element is spaced apart from the second end of the intermediate element. Heating elements are located between the elements, to heat the proximal portions of the elements to a hot working temperature, at which the heated portions are subject to plastic deformation. The heating elements are removed, and while the intermediate element is rotating, the first end is urged against the stub element to bond the intermediate element with the stub element. While the extension element is rotating, the inner end is urged against the second end to bond the extension element and the intermediate element.

A method for manufacturing a clad steel pipe is provided, wherein the clad steel pipe is manufactured by using a clad steel plate as a raw material. The clad steel plate comprises a base layer (1) and a clad layer (2) roll-bonded with the base layer (1). The method for manufacturing a clad steel pipe comprises the steps of forming, welding, and deburring; both sides of the clad steel plate are bent towards the base layer (1) side of the clad steel plate, then the forming step is carried out, and after the forming step, the opening faces of the resultant pipe blank are all in a form of the clad layer (2). According to the method for manufacturing a clad steel pipe, a clad steel pipe is manufactured by using a clad steel plate as a raw material. Thus, continuance and high efficiency of a high-frequency longitudinal welding pipe unit is fully utilized, subsequent non-continuous processes are not necessary, and the corrosion resistance at the weld of the clad steel pipe is ensured.

The present invention relates to an air conditioner. The air conditioner according to the present embodiment has a refrigeration capacity of 7 kW to 11 kW, inclusive, and uses a refrigerant R32 as a refrigerant, and since a refrigerant pipe therein is made of a ductile stainless steel material having 1% or less of a delta-ferrite matrix structure with respect to the grain size area thereof, and includes a suction pipe guiding the suction of the refrigerant into a compressor and having an outer diameter of 15.88 mm, the refrigerant pipe can maintain strength and hardness as good as or better than those of a copper pipe, while also maintaining good processability.

Induction welding device for variable diameter pipes comprising three inductors configured in the shape of a cam, placed in symmetry in relation to the axial axis of the pipe to be welded, an oscillator connected to each inductor, a mechanical system connected to each inductor, designed to force each inductor to make contact with the pipe by the corresponding degree in relation to the diameter of the pipe at each position, so that the position of the inductors in relation to the pipe changes radially as the diameter of the section of the pipe to be welded also changes.

A waterwall panel welding apparatus is provided. The apparatus includes an inlet assembly, a welding assembly, an outlet assembly, and a heating system. The inlet assembly is for receiving a plurality of tubes. The welding assembly is for receiving the tubes from the inlet assembly and for allowing the tubes to be welded together to form a waterwall panel. The outlet assembly is for receiving the waterwall panel from the welding assembly. The heating system heats the tubes and operates via magnetic induction.

An induction heating system includes an induction heating head assembly configured to move relative to a workpiece. The induction heating system may also include a temperature sensor assembly configured to detect a temperature of the workpiece and/or a travel sensor assembly configured to detect a position, movement, or direction of movement of the induction heating head assembly relative to the workpiece, and to transmit feedback signals to a controller configured to adjust the power provided to the induction heating head assembly by a power source based at least in part on the feedback signals. In certain embodiments, the induction heating system may also include a connection box configured to receive the feedback signals, to perform certain conversions of the feedback signals, and to provide the feedback signals to the power source. Furthermore, in certain embodiments, the induction heating system may include an inductor stand assembly configured to hold the induction heating head assembly against the workpiece.

An apparatus (10) for joining a predetermined geometrical profile shape from a sheet material (SM) includes a positioning assembly (12) including a base member (14) and a frame (16) that is operable to receive the sheet material (SM), to configure the sheet material in a predetermined orientation and to linearly translate the sheet material along a process direction (20). A Z-bar (22) is configured to guide a first longitudinal edge (FE) and second longitudinal edge (SE) of the sheet material (SM) into adjacent alignment along the process direction (20). A welding and forging assembly (60) welds and then forges a seam between the first longitudinal edge (FE) and the second longitudinal edge (SE) of the associated sheet material (SM).

A method and device for creating an environmentally sealed connection for transfer between a first region and a second region, the first region and the second region each having an at least partially flexible barrier with connection portions, comprising the following steps: (i) superposition of said connection portions of the barriers in a sandwich arrangement, wherein each connection portion comprises a first area at least partially made of thermo-resistant material and a second area comprising a first welding band zone of a closed geometrical shape, said first and second area of each barrier being arranged to face one another, with the first areas of the two barriers forming the outside layers of the sandwich arrangement, and the second areas of the two barriers forming the inside layers of the sandwich arrangement, wherein the first areas are positioned to cover the first welding band zones of the second zones, (ii) joining the second areas by welding of the first closed welding band zones, whereby a first separation line, comprised inside and along the length of the first welding band zone, is cut as a result of the welding and whereby the barrier areas enclosed by the separation line are welded along their edges to form an insert, which becomes detached from the at least partially flexible barriers, and (iii) distancing the first areas of the super-positioned connection portions from each other, for example by pulling them apart, thereby revealing an opening confined by the welded seam connecting the second areas of the at least partially flexible barriers and joining the first region with the second region.

A method of controlling highly regulated power and frequency from a high frequency power supply system to provide a highly regulated power and frequency to a workpiece load where the highly regulated power and frequency can be independent of the workpiece load characteristics by inverter switching control and an inverter output impedance adjusting and frequency control network that can include precision variable reactor pairs with a geometrically-shaped moveable insert core section and a stationary split-bus section with a complementary geometrically-shaped split bus section and a split electric terminal bus section where the insert core section can be moved relative to the stationary split-bus section to vary the inductance of the variable reactors.

A seam guide assembly configured to maintain the longitudinal edges of a metal strip in position before welding in a welding section of a welded tube roll forming apparatus, the seam guide assembly having a front seam guide tip component, a through channel being provided in the holder, the channel having an inlet opening located on said first side of the holder, adjacent the front seam guide tip component, and an outlet opening located on a second side of the holder, the outlet opening being configured to connect to a vacuum source; a welded tube roll forming apparatus having a vacuum extraction section configured to extract solid particles produced inside the tube during the high frequency induction welding of the tube edges, and being located in the apparatus at a position where the where the edges of the roll formed tube have not yet been welded together; and related method.