Small diameter pipe butt welding technology of horizontal fixed bottom

(1) Arc ignition — arc welding ignition When welding with alkaline electrode, in the process of arc initiation, due to less slag, less protective gas in the arc, so that the pool protection effect is not good, the weld is very easy to appear dense pores, mostly N2 pores. In order to prevent the occurrence of this kind of phenomenon, the arc of the alkaline electrode is mostly scratched. In the front of the clock at 6 o ‘clock position welding was 10 mm in arc, pull the arc to welding, arc preheating the clock at 6 o ‘clock position, when found groove root “sweat” phenomenon, the electrodes to the top, inside groove gap after hearing “poop-poop” sound, just a moment, make a blunt edge melting 1-2 mm on each side and formed the first melt hole of arc work finished. The current of alkaline electrode is about 10% less than that of acid electrode of the same diameter. Therefore, in the process of arc ignition, the welder is required to be steady, high technology, and the arc ignition and arc return action should be fast and accurate. (2) Arc breaking welding In the clock 6-5 point position, that is, the inverted welding position arc, with the long arc for preheating, when the end of the electrode melting state, with the wrist will be the end of the first, second drop of melting drop away. At the same time, observe the “sweat” phenomenon in the preheating place, quickly and accurately put the electrode droplet into the gap at the beginning of the welding end, do a little swing around the same time, the electrode is pushed back a little above, and then diagontically below the arc, arc extinguishing, the first weld pool is formed in this way, the arc work is over. (3) welding rod Angle 1) from the solder point, that is, the clock 5-6 points, welding rod and welding direction pipe tangent Angle of 80-85°. 2) In the clock 7-8 point position for the upward welding climbing welding, welding rod and welding direction of the tangent line of the Angle of 100°-105°. 3) In the vertical welding position, namely the clock 9 o ‘clock position, the Angle between the electrode and the tangent line of the welding direction pipe is 90°. 4) In the vertical climbing welding position, that is, in the welding process at the clock 10-11 points, the Angle between the electrode and the tangent line of the welding direction pipe is 85-90°. 5) When welding in the flat welding position, that is, the clock 12 o ‘clock position, the Angle between the electrode and the tangent line of the welding direction pipe is 75-80°.铜焊丝,Copper Welding Rods,铝焊丝,aluminium welding wire,镍焊条,Nickel electrode,药皮焊条,Flux Coated Brazing Welding Rods