An amorphous, ductile brazing foil is provided. According to one example embodiment, the composition consists essentially of Ni.sub.restCr.sub.aB.sub.bP.sub.cSi.sub.d with 2 atomic percenta30 atomic percent; 0.5 atomic percentb14 atomic percent; 2 atomic percentc20 atomic percent; 0 atomic percentd14 atomic percent; incidental impurities0.5 atomic percent; rest Ni, where c>b>c/15 and 10 atomic percentb+c+d25 atomic percent.

An amorphous, ductile brazing foil is provided. According to one example embodiment, the composition consists essentially of Ni.sub.restCr.sub.aB.sub.bP.sub.cSi.sub.d with 2 atomic percenta30 atomic percent; 0.5 atomic percentb14 atomic percent; 2 atomic percentc20 atomic percent; 0 atomic percentd14 atomic percent; incidental impurities0.5 atomic percent; rest Ni, where c>b>c/15 and 10 atomic percentb+c+d25 atomic percent.

An exhaust gas recirculation (EGR) cooler having a tube, including a tube made of an aluminum alloy is installed to cool exhaust gas recirculated from an exhaust line of an internal combustion engine to an intake line of the EGR cooler. The aluminum alloy includes a predetermined weight ratio (wt %) of each of zirconium, silicon, iron, magnesium, and manganese.

An exhaust gas recirculation (EGR) cooler having a tube, including a tube made of an aluminum alloy is installed to cool exhaust gas recirculated from an exhaust line of an internal combustion engine to an intake line of the EGR cooler. The aluminum alloy includes a predetermined weight ratio (wt %) of each of zirconium, silicon, iron, magnesium, and manganese.

The invention is related to a heat exchanger (1), which comprises: at least one column of parallel tubes (2) which are arranged in a stack and which define a longitudinal direction; a housing (3) inside which the tubes (2) are housed, the tubes (2) being separated from one another, so as to configure a channel for the passage of cooling fluid consisting of: passage sections (4) between tubes (2) that are contiguous in the direction of the stack; passage sections (5) between tubes and housing (3); and baffles (6, 7) that deflect the cooling fluid. According to the invention, the baffles are at least two lamellar bodies (6, 7) of a single piece arranged in a plane perpendicular to the longitudinal direction.

A water-cooled exhaust gas recirculation (EGR) cooler may include tubes positioned within a housing at a predetermined interval, which forms an exhaust gas passage that exhaust gas passes therethrough, and a tube bonded portion that seals internally and externally the tube is provided at a first side of the tube; and supporters interpose the tubes to define a predetermined interval between the tubes and positioned within the housing wherein a coolant passage which a coolant flows between the tubes is formed, wherein an external surface of a first side of the supporter is bonded to an external surface of the tubes to form a reinforcing bonded portion wherein the supporter covers and seals the tube bonded portion.

A water-cooled exhaust gas recirculation (EGR) cooler may include tubes positioned within a housing at a predetermined interval, which forms an exhaust gas passage that exhaust gas passes therethrough, and a tube bonded portion that seals internally and externally the tube is provided at a first side of the tube; and supporters interpose the tubes to define a predetermined interval between the tubes and positioned within the housing wherein a coolant passage which a coolant flows between the tubes is formed, wherein an external surface of a first side of the supporter is bonded to an external surface of the tubes to form a reinforcing bonded portion wherein the supporter covers and seals the tube bonded portion.

A water-cooled exhaust gas recirculation (EGR) cooler may include tubes positioned within a housing at a predetermined interval, which forms an exhaust gas passage that exhaust gas passes therethrough, and a tube bonded portion that seals internally and externally the tube is provided at a first side of the tube; and supporters interpose the tubes to define a predetermined interval between the tubes and positioned within the housing wherein a coolant passage which a coolant flows between the tubes is formed, wherein an external surface of a first side of the supporter is bonded to an external surface of the tubes to form a reinforcing bonded portion wherein the supporter covers and seals the tube bonded portion.

A combination structure of an Exhaust Gas Recirculation (EGR) cooler may include a housing open at both sides thereof, a plurality of headers inserted in both of the sides of the housing and having a circumference forming a layer with the housing, and a plurality of diffusers each including a coupling portion, which is inserted in the headers to form a layer with the housing and the headers, at a first side and having a hole for receiving and discharging exhaust gas at a second side, in which sides of the housing and the headers may be welded, and the housing, the circumference of the headers, and coupling portions of the diffusers may be welded.

A combination structure of an Exhaust Gas Recirculation (EGR) cooler may include a housing open at both sides thereof, a plurality of headers inserted in both of the sides of the housing and having a circumference forming a layer with the housing, and a plurality of diffusers each including a coupling portion, which is inserted in the headers to form a layer with the housing and the headers, at a first side and having a hole for receiving and discharging exhaust gas at a second side, in which sides of the housing and the headers may be welded, and the housing, the circumference of the headers, and coupling portions of the diffusers may be welded.