Method for manufacturing finned tube
Currently, Murphy finned tubes are manufactured by automatic welding using the MAG (metal active gas welding) method. Use fillet welds or welds under fins to make joints.
Fiber lasers are used in the fabrication of finned tubes. Pull the strip mechanically and bend it to form a u-shaped, l-shaped or i-shaped section, which is then wound to the rotating tube by a convenient feed roller. Upon contact with flat steel, the laser beam or MAG welding arc is guided on the lower surface of the U, L or I sections, and the resulting fillet weld is melted by the laser beam. The width of the laser beam shall be such that the width of the weld shall be equal to 1 to 1.25 of the width of the fin. Laser beam welding is performed at a high speed of more than 1 m/min without preheating the tube or preheating it to approximately 200 m prior to welding. 100 0C. Filler in the form of a welding wire dispersed in the focus beam area may be used for welding.
Enables finned tubes to be manufactured efficiently without weld defects, whether or not packing is used. A continuous penetration weld with very low weld deformation and narrow heat - affected zone is obtained. The application of this method improves the welding speed, avoids the use of filler, provides continuous penetration welding and improves manufacturing economy.
A 57.5mm diameter transmission tube I made of P235GH steel is combined with a 1.0mm thick u-shaped, l-shaped or l-shaped fin 3 made of S235GH steel by laser beam 4 at a speed of 10. M/min presses U -, L - or l-shaped fins to the tube by means of mechanical 6. The 10kW fiber laser 5 is used with the inert gas hood. Heat the tube to 50 0C before welding. The resulting bond 2 is a continuous penetration weld with a hardness less than 320 HV.
1. The first method of fabricating finned tubes is characterized by the use of a laser beam and a u-shaped finned portion in order to secure the fins to the tube, where welding is carried out along the lower part of the fin in a downward position between the flanges without the need for welding. Any other operation performed at a speed greater than 1 m/min while preheating the panel to 0-100 0C prior to welding.
2. The second method of fabricating finned tubes is characterized by the use of a laser beam and an l-shaped finned portion in order to secure the fins to the tube, where welding is carried out along the lower part of the fin in a downward position between the flanges without the need for welding. Any other operation performed at a speed greater than 1 m/min while preheating the panel to 0-100 0C prior to welding.
3. The third method for fabricating finned tubes is characterized by the use of a hybrid system: metal-active gas (MAG) welding + laser beam in order to attach the fins to the tube, where the welding is done by using the flat steel prepared. The fillet welds were fabricated by MAG welding and then fused by laser beam so that the finned tubes had continuous, complete penetration welds whose thickness was greater than that of the fins.
4. The fourth method of fabricating finned tubes is characterized by the use of a laser beam and an i-shaped finned portion for fastening the fins to the tube, where welding is performed on the sides of the fins without any additional operation at a higher speed. The speed does not exceed 1 m/min, while preheat the panel to 0-100° c before welding.
Fiber lasers are used in the fabrication of finned tubes. Pull the strip mechanically and bend it to form a u-shaped, l-shaped or i-shaped section, which is then wound to the rotating tube by a convenient feed roller. Upon contact with flat steel, the laser beam or MAG welding arc is guided on the lower surface of the U, L or I sections, and the resulting fillet weld is melted by the laser beam. The width of the laser beam shall be such that the width of the weld shall be equal to 1 to 1.25 of the width of the fin. Laser beam welding is performed at a high speed of more than 1 m/min without preheating the tube or preheating it to approximately 200 m prior to welding. 100 0C. Filler in the form of a welding wire dispersed in the focus beam area may be used for welding.
Enables finned tubes to be manufactured efficiently without weld defects, whether or not packing is used. A continuous penetration weld with very low weld deformation and narrow heat - affected zone is obtained. The application of this method improves the welding speed, avoids the use of filler, provides continuous penetration welding and improves manufacturing economy.
A 57.5mm diameter transmission tube I made of P235GH steel is combined with a 1.0mm thick u-shaped, l-shaped or l-shaped fin 3 made of S235GH steel by laser beam 4 at a speed of 10. M/min presses U -, L - or l-shaped fins to the tube by means of mechanical 6. The 10kW fiber laser 5 is used with the inert gas hood. Heat the tube to 50 0C before welding. The resulting bond 2 is a continuous penetration weld with a hardness less than 320 HV.
1. The first method of fabricating finned tubes is characterized by the use of a laser beam and a u-shaped finned portion in order to secure the fins to the tube, where welding is carried out along the lower part of the fin in a downward position between the flanges without the need for welding. Any other operation performed at a speed greater than 1 m/min while preheating the panel to 0-100 0C prior to welding.
2. The second method of fabricating finned tubes is characterized by the use of a laser beam and an l-shaped finned portion in order to secure the fins to the tube, where welding is carried out along the lower part of the fin in a downward position between the flanges without the need for welding. Any other operation performed at a speed greater than 1 m/min while preheating the panel to 0-100 0C prior to welding.
3. The third method for fabricating finned tubes is characterized by the use of a hybrid system: metal-active gas (MAG) welding + laser beam in order to attach the fins to the tube, where the welding is done by using the flat steel prepared. The fillet welds were fabricated by MAG welding and then fused by laser beam so that the finned tubes had continuous, complete penetration welds whose thickness was greater than that of the fins.
4. The fourth method of fabricating finned tubes is characterized by the use of a laser beam and an i-shaped finned portion for fastening the fins to the tube, where welding is performed on the sides of the fins without any additional operation at a higher speed. The speed does not exceed 1 m/min, while preheat the panel to 0-100° c before welding.
评论
发表评论