Of conduit of large requirements, large wall solder

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  • source:BAGANZ CNC Machining
Full automatic solder large requirements, large wall (be more than 21mm) cop often uses U groove or compound model groove, because U groove, compound groove machines force of time-consuming, bad news,restrict conduit to solder efficiency. Treatment of V form groove is simple, when the province, save labour, but V of cop of large requirements, large wall groove is full automatic when soldering, if solder craft parameter choice is undeserved, will bring about weld defects generation. As conduit construction uses grade of steel tube intensity to rise to level of X70, X80, be in charge of the accretion with diameter and large wall, begin to use automatic solder technology gradually in pipeline construction since 2003. Conduit is automatic because solder technology solders efficiency is tall, labor intensity is small, solder the process gets factitious factor the impact is little wait for an advantage, very large latent capacity is had in the application that builds in conduit of large requirements, large wall. But the conduit of our country solders automatically the technology is in development phase, a few problems in soldering if root ministry incomplete fusion, sidewall not shirt-sleeve, groove is complex wait to had been not solved thoroughly; Solder automatically cop of large requirements, large wall often uses U groove or compound model groove, the establishment of form a complete set such as machine of plastics of groove tubal end has not mature, so V of conduit of research large requirements, large wall groove solders automatically the technology is very significant. Enrage on the west east be defeated by second line halfback - length of the whole line of line of Jing Bian contact makes an appointment with 345km, grade of steel tube intensity is X70, tubal diameter is φ 1016, the wall is large for 14.

6mm, 17.

5mm, 21.

0mm and 26.

2mm, grow according to this project characteristic celebrated construction project head office to introduce CRC full automatic welder, apply in contact line Duan Bihou is 1B mark 21.

On 0mm conduit. Solder method, equipment, material solders the method uses STT root solder + side of hot solder of CRC-P260 automatic welder, fill, lid. Solder equipment: Automatic welder of Lincoln STT welder, Lincoln DC-400, CRC-P260. Protect gas: Protection of STT root solder enrages 100 ％ CO2, full automatic solder protection gas is ＋ of 80 ％ Ar 20 ％ CO2. Solder material is shown 1 times like the watch. Graph if form of groove of path of solder of order of form of connect of 1 groove form and solder path pursues show 1 times, solder path order is shown 2 times like the graph. Graph order of 2 solder path solders experiment and analyse automatic solder commonly used and compound groove or U groove, also can use V groove in little wall thick cop, their common characteristic is clearance of groove able to read aloud fluently lesser. Enrage on the west east be defeated by wall of second line conduit thick for 21.

0mm, the width of able to read aloud fluently of V groove is 22mm about, this width already approached limit of amplitude of CRC-P260 welding torch. Such groove type is an enormous challenge to soldering automatically. Basis before experience decided automatic solder experiment solders craft parameter (if express,show 2 times) . Use above parameter to undertake soldering automatically experimenting, experiment in soldering, discover easy occurrence blemish has automatic welding line the incomplete fusion between the layer, sidewall incomplete fusion, concentrated stoma, place that admire solder Yu Gaochao mark. In process trying solder, electric current is in in 21~23V, speed sending silk in 210~235A, voltage 420~480in/min, solder speed is when 12~15in/min, experiment incomplete fusion of circumstance of the incomplete fusion between the layer, groove and concentrated and stomatic circumstance did not appear almost on welding line of F1 of the discovery in soldering, F2, F3. The analysis thinks width of groove of 3 F1, F2, F3, welding line is small, aeriform protection is sufficient, won't produce nitrogen aperture consequently; Groove width is small make welding torch amplitude small, swing frequency is tall, in speed sending silk particular case issues mother capable person and fill metal fusion sufficient, the odds that produces incomplete fusion consequently is lesser; Yu Gao of welding line of the place that admire solder is not big. Electric current is in in 18~22V, speed sending silk in 200~250A, voltage 400~500in/min, solder speed is when 12~16in/min, the incomplete fusion between occurrence layer of position of vertical position welding of welding line of section of F4 of the discovery in experiment solder, F5, F6 and groove incomplete fusion, but still appear without air hole, yu Gao of the part that admire solder is not big. The solder seam welding that produces the incomplete fusion between the layer and groove incomplete fusion receives electric current to be less than 220A, voltage 21V, speed sending silk is less than 450 In/min, solder speed is more than 15in/min, and welding torch swings frequency is less than 90 times / Min. Heighten tension of speed sending silk, electric current (adjust welding wire to extend length) , increase welding torch to swing extent chooses faster welding torch to swing as far as possible at the same time place of vertical position welding of frequency, control solders after speed, the incomplete fusion between the layer and groove incomplete fusion did not discover after F4, F5, F6 detects. Electric current is in in 20~22V, speed sending silk in 220~250A, voltage 450~500in/min, solder speed is when 14~16in/min, the welding line that cover a range did not discover incomplete fusion, but the welding line that cover a range is in the position that admire solder Yu Gaochao mark. The analysis thinks width of the welding line that cover a range is 18~22mm about, this width is adjacent CRC-P260 welding torch is the biggest swing extent, and broad welding line, welding torch places frequency amplitude, quickly to make bath existence time long greatly and there is mix effect to bath when welding torch moves, metal of apply of frit of the position that admire solder is in the action such as force of gravitational, electromagnetism is flagging, bring about welding line of the position that admire solder then more than excellent mark. To assure good lid the face shapes the effect, the solder that cover a range solders lesserly in the choice speed while reduce welding torch to swing as far as possible frequency, the made welding line that cover a range is small and wide, reduced bath existence time thereby, achieved the goal that reduces Yu Gao of the position that admire solder. Solder craft parameter pursues exterior of 3 welding line reachs an analysis to decide to be enraged on the west finally according to trying solder result east be defeated by CRC of ＋ of solder of root of STT of line of second line contact full automatic parameter of craft of side of solder fill, lid (if express,show 3 times) . The basis is expressed 3 solder parameter solders, welding line does not have the blemish such as stomatic, crackle, incomplete fusion via detecting, welding line surface shapes circumstance (show 3 times like the graph) , macroscopical metallographic is good (if pursue,4 are shown) . Graph function of machinery of macroscopical metallographic welding line passes 4 welding line academy of science of conduit of Chinese oil natural gas solders technical center detects, each index is accorded with enrage on the west east be defeated by line of second line contact to accept construction demand. ＋ of STT root solder CRC-P260 solders automatically in large requirements, large wall (V groove) the success application on conduit, filled fission to show to solder automatically the technology is high grade, efficient, low the characteristic of labor intensity. CNC Milling