2019年7月10日（水）
control the temperature
Cover, the edge of the groove should be a little pause to ensure that the molten pool and groove better fusion, the welding process of the welding arm of the swing amplitude and frequency to adapt to ensure that the cover surface weld surface size and edge fusion neat. Welding, the torch angle to the vertical axis with the tube, because the tube is round, so the angle of the torch to change at any time, so as to ensure the quality of the weld to avoid the pores of the weld, slag and so on. When the cover is welded, pay attention to whether the nozzle and the contact nozzle are clean, the size of the gas flow is appropriate, clean the bottom surface, and control the inter-layer temperature.
Wire feed, remove the frequency faster than the solid wire. Due to filling, cover layer with gas shielded welding, wire length of the length of the welding process on the stability of the greater impact of the longer wire length, wire resistance increases, the wire overheating and melting, the results of the welding process unstable welding, metal splash serious, poor weld formation, the protection of the molten pool is not good; wire length is too short, the welding current increases, the distance between the nozzle and the workpiece to shorten the welding line of sight is unclear, while also causing the nozzle to overheat, causing the splash to stick or clog the nozzle, thereby affecting the gas flow. Such as found crater cracks, shrinkage and other defects, should be cleaned and then welded.In the process of MAG welding, the length of the welding wire is 8 ~ 9mm, the amplitude, frequency, speed and edge residence time of the welding torch are coordinated with the appropriate action, and the angle of the welding torch is adjusted at any time to make the edge of the weld surface neatly and beautifully to ensure the quality of filling and cover layer.
Wire feed, remove the frequency faster than the solid wire. Due to filling, cover layer with gas shielded welding, wire length of the length of the welding process on the stability of the greater impact of the longer wire length, wire resistance increases, the wire overheating and melting, the results of the welding process unstable welding, metal splash serious, poor weld formation, the protection of the molten pool is not good; wire length is too short, the welding current increases, the distance between the nozzle and the workpiece to shorten the welding line of sight is unclear, while also causing the nozzle to overheat, causing the splash to stick or clog the nozzle, thereby affecting the gas flow. Such as found crater cracks, shrinkage and other defects, should be cleaned and then welded.In the process of MAG welding, the length of the welding wire is 8 ~ 9mm, the amplitude, frequency, speed and edge residence time of the welding torch are coordinated with the appropriate action, and the angle of the welding torch is adjusted at any time to make the edge of the weld surface neatly and beautifully to ensure the quality of filling and cover layer.
2019年7月10日（水）
To ensure the quality of the weld
Cover, the edge of the groove should be a little pause to ensure that the molten pool and groove better fusion, the welding process of the welding arm of the swing amplitude and frequency to adapt to ensure that the cover surface weld surface size and edge fusion neat. Welding, the torch angle to the vertical axis with the tube, because the tube is round, so the angle of the torch to change at any time, so as to ensure the quality of the weld to avoid the pores of the weld, slag and so on.
When the cover is welded, pay attention to whether the nozzle and the contact nozzle are clean, the size of the gas flow is appropriate, clean the bottom surface, and control the inter-layer temperature. The distance from the wire should be such that the end of the wire is within the argon protection zone to avoid oxidation of the ends. Wire feed, remove the frequency faster than the solid wire. Due to filling, cover layer with gas shielded welding, wire length of the length of the welding process on the stability of the greater impact of the longer wire length, wire resistance increases, the wire overheating and melting, the results of the welding process unstable welding, metal splash serious, poor weld formation, the protection of the molten pool is not good; wire length is too short, the welding current increases, the distance between the nozzle and the workpiece to shorten the welding line of sight is unclear, while also causing the nozzle to overheat, causing the splash to stick or clog the nozzle, thereby affecting the gas flow.
Such as found crater cracks, shrinkage and other defects, should be cleaned and then welded.In the process of MAG welding, the length of the welding wire is 8 ~ 9mm, the amplitude, frequency, speed and edge residence time of the welding torch are coordinated with the appropriate action, and the angle of the welding torch is adjusted at any time to make the edge of the weld surface neatly and beautifully to ensure the quality of filling and cover layer. When the welding with a small crescent-shaped swing, both sides to stay stable arc, the middle speed is slightly faster, so you can avoid the welding of the weld raised, not flat; upper and lower joints have to cross the center line 5 ~ 10mm, the latter half circle filling, cover the top welding joints, the first half of the arc welding position can be a gentle slope, so that the second half of the joints will not produce defects; fill, pay attention to the edge of the groove should not be arc abrasions, surfacing. At the same time, can increase the base material groove on both sides of the amount of heat input to prevent unilateral non-fusion. When filling the wire, the wire should be sent to the root of the molten pool, and gently press down to ensure that the root penetration and root formation.
To ensure the quality of the weld.Bottom welding, welding gun angle, welding wire angle and carbon steel welding is basically the same. In order to solve these problems, to ensure the quality of the weld, in the construction, the bottom of the use of flux cored spray nozzle types wire TIG welding (TIG), filled, cover the use of gas protection metal arc welding (MAG).Austenitic stainless steel tube to play the bottom of the welding, in the past by hand TIG welding with solid wire welding method, the tube to prevent the root of Ar to prevent oxidation of the weld to ensure the internal quality of the weld. But the tube filling Ar at the scene construction is difficult, equipment, tank joints and long pipe welding when the amount of Ar, especially high-altitude operation is not conducive to the construction, and auxiliary labor, and very uneconomical.In the welding process, the torch to do arc-shaped swing, the purpose is to accelerate the separation of molten iron and slag, easy to observe the pool. When the arc is closed, the crater should be filled.
When the cover is welded, pay attention to whether the nozzle and the contact nozzle are clean, the size of the gas flow is appropriate, clean the bottom surface, and control the inter-layer temperature. The distance from the wire should be such that the end of the wire is within the argon protection zone to avoid oxidation of the ends. Wire feed, remove the frequency faster than the solid wire. Due to filling, cover layer with gas shielded welding, wire length of the length of the welding process on the stability of the greater impact of the longer wire length, wire resistance increases, the wire overheating and melting, the results of the welding process unstable welding, metal splash serious, poor weld formation, the protection of the molten pool is not good; wire length is too short, the welding current increases, the distance between the nozzle and the workpiece to shorten the welding line of sight is unclear, while also causing the nozzle to overheat, causing the splash to stick or clog the nozzle, thereby affecting the gas flow.
Such as found crater cracks, shrinkage and other defects, should be cleaned and then welded.In the process of MAG welding, the length of the welding wire is 8 ~ 9mm, the amplitude, frequency, speed and edge residence time of the welding torch are coordinated with the appropriate action, and the angle of the welding torch is adjusted at any time to make the edge of the weld surface neatly and beautifully to ensure the quality of filling and cover layer. When the welding with a small crescent-shaped swing, both sides to stay stable arc, the middle speed is slightly faster, so you can avoid the welding of the weld raised, not flat; upper and lower joints have to cross the center line 5 ~ 10mm, the latter half circle filling, cover the top welding joints, the first half of the arc welding position can be a gentle slope, so that the second half of the joints will not produce defects; fill, pay attention to the edge of the groove should not be arc abrasions, surfacing. At the same time, can increase the base material groove on both sides of the amount of heat input to prevent unilateral non-fusion. When filling the wire, the wire should be sent to the root of the molten pool, and gently press down to ensure that the root penetration and root formation.
To ensure the quality of the weld.Bottom welding, welding gun angle, welding wire angle and carbon steel welding is basically the same. In order to solve these problems, to ensure the quality of the weld, in the construction, the bottom of the use of flux cored spray nozzle types wire TIG welding (TIG), filled, cover the use of gas protection metal arc welding (MAG).Austenitic stainless steel tube to play the bottom of the welding, in the past by hand TIG welding with solid wire welding method, the tube to prevent the root of Ar to prevent oxidation of the weld to ensure the internal quality of the weld. But the tube filling Ar at the scene construction is difficult, equipment, tank joints and long pipe welding when the amount of Ar, especially high-altitude operation is not conducive to the construction, and auxiliary labor, and very uneconomical.In the welding process, the torch to do arc-shaped swing, the purpose is to accelerate the separation of molten iron and slag, easy to observe the pool. When the arc is closed, the crater should be filled.
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