Abstract: In a lead soldering alloy for soldering parts of which one at least is made of an aluminum containing alloy and the other of heavy metal, the antimony content of the alloy is reduced so as to be between 0.2 and 1% by weight.

Abstract: The header delimits a bearing portion 14 against which abuts a partition connected to the inner wall of the header by a gasket 17. A pipe for supplying the liquid to be cooled arrives beneath the partition 8 and a degassing duct 24 arrives above the partition in a compartment closed by a stopper.

Abstract: To ensure regulation of the temperature of the supercharging air of a diesel engine, the overfeeding air passes into a first heat exchanger which is cooled by the cooling water of the engine having passed into a second heat exchanger in which the flow is sufficiently low to substantially cool the water. The remaining portion of the water to be cooled passes through a third heat exchanger placed downstream the second heat exchanger. The water having cooled the supercharging air passes also into an oil heat exchanger.

Abstract: Tube passages slightly bigger than the tubes are formed in a plate. A soft resilient sheet is placed on one side of the plate. The tube is forcibly inserted in the tube passages and draws a portion of the sheet which is then cut. In the assembly the sheet, which has a bigger thickness than the interval between the tube and the tube passage, forms a flange beyond the tube plate.

Abstract: The machine comprises a fixedly mounted holder maintaining the pipe in a position so that the end thereof which is to be formed extends in a horizontal plane. Two complementary or mating pins are insertable in this end of the pipe. Supporting and driving means are provided for moving the two pins in opposite directions for a distance corresponding to the deformation to be given to this end of the pipe.

Abstract: The machine comprises an endless guiding path for mobile supports equally spaced by a distance smaller than the length of the smallest heat exchanger to be brazed. The supports have protruding portions cooperating with the bottom on the same side of the end plates of the heat exchangers.

Abstract: Tube passages slightly bigger than the tubes are formed in a plate. A soft resilient sheet is placed on one side of the plate. The tube is forcibly inserted in the tube passages and draws a portion of the sheet which is then cut. In the assembly of the sheet, which has a bigger thickness than the interval between the tube and the tube passage, forms a flange beyond the tube plate.

Abstract: The exchanger comprises tubes separated by intercalary parts and engaged into end plates covered with header boxes. The tightness of the header boxes is provided by a soft joint 13. A brazing alloy is sandwiched between two sheets of aluminum.

Abstract: The soldering alloy comprises at least:65 to 85% lead in weight12 to 30% cadmium in weight1 to 6% antimony in weight0.5 to 1% tin in weight.In a method for soldering metal parts, the parts are submitted to an organic flux on the portions thereof to be connected together, said portions are coated with the above mentioned soldering alloy, then they are heated to the liquidus temperature of the soldering alloy while being held together in contact.

Abstract: Tube ends are engaged in passage openings of tube plates and protrude above collars surrounding said passage openings. The larger sides of the tube ends are folded back and rolled about said collars. Part of the tube walls under said passage openings is enlarged.

Abstract: The soldering alloy comprises at least :65 to 85% lead in weight12 to 30% cadmium in weight1 to 6% antimony in weight0.5 to 1% tin in weight.In a method for soldering metal parts, the parts are submitted to an organic flux on the portions thereof to be connected together, said portions are coated with the above mentioned soldering alloy, then they are heated to the liquidus temperature of the soldering alloy while being held together in contact.

Abstract: The flanges of the heat-exchanger comprise at two ends thereof lugs or connecting members delimiting a transverse fold extended by a tongue up to the tube plates. The ends of the tubes are positioned in the tube plates and the tongue is fixed to the tube plate. The assembled heat exchanger is then submitted to brazing.

Abstract: A support plate is permanently fixed on the table of the press, which plate has mounted on the top thereof rollers, lateral guides and an abutment. Sets of tools are used, each of them comprising an upper tool and a lower tool. They are connected together by guiding columns and safety upright, so as to have always a constant total height. When being installed the sets of tools are located, or removed by moving the bed-plate of the lower tool on the rollers of the support plate. After placing and locating the tools, the bed-plate of the lower tool is clamped on the support plate and the bed-plate of the upper tool is clamped on the slide member of the press. After removal of the safety upright, the press is then ready to operate.

Abstract: The machine comprises a frame, a rotating gripper supported by the frame and comprising two arms provided with removable bearing plates for the end-plates of a radiator, pressing means maintaining the header boxes of the radiator on the end plates, and two heating units adjustably mounted on parallel shafts for the welding of these two parts.

Abstract: The process is characterized in that hot gas are blown at right angle with the front face of the parts to be brazed into the contiguous areas of an enclosure. The speed of the hot gas in a first area is regulated in order to ensure pre-heating, the speed in a second area is regulated in order to increase the temperature to the brazing temperature and the speed in a third area is regulated in order to ensure at least a partial cooling of the parts before they are withdrawn from the enclosure.

Abstract: Radiator comprising tubes, tube plates fitting ends of said tubes, lateral flanges and corrugated fins inserted between the tubes and between the tubes and the flanges. A bearing area is designed along the flanges or the tubes close to the tube plate for applying end fins between the flange and the adjacent tube. Means are designed for at least limiting joining portions of said fins extending at the level of said area.

Abstract: The machine comprises a rotary table supporting similar working stations. Each station supports a reference heat exchanger and a heat exchanger to be tested. The operations related to a simultaneous supply of compressed gas in the two exchangers, isolation of said exhangers, control of their residual pressure, etc... are controlled during a complete rotation of the table from fixed annular segments placed concentrically to the table and read by brushes supported by bars related to each working station.