Small diameter pipe butt horizontal fixed bottom welding technology

(1) arc ignition — arc ignition by continuous arc welding When welding with alkaline electrode, in the arc starting process, due to less slag, less protective gas in the arc and other reasons, so that the molten pool protection effect is not good, the weld is very prone to dense pores, mostly N2 pores. In order to prevent this kind of phenomenon, the arc of the alkaline electrode is 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. Alkaline electrodes require about 10% less current than acidic electrodes of the same diameter. To this end, the arc starting process requires the welder steady hand, high technology, arc starting and arc back action to be fast and accurate. (2) arc initiation by arc breaking welding In the clock 6-5 point position, that is, inverted welding position arc, with long arc preheating, when the electrode end melting state, the wrist force will be the electrode end of the first and second drops of molten drop off. At the same time, observe the phenomenon of “sweating” in the preheating, quickly and accurately send the electrode droplets into the gap at the beginning of the welding end, do a little left and right swing at the same time, the electrode is pushed back above a little, and then inclined below the arc, arc extinction, the first molten pool is thus formed, the end of the arc. (3) Welding rod Angle 1) Starting point, that is, the clock 5-6 point, welding rod and welding direction tube tangent Angle is 80-85°. 2) The position of clock 7-8 is inverted welding climbing welding, and the included Angle of the tangent line between the welding rod and the welding direction tube is 100°-105°. 3) In the vertical welding position, that is, clock 9 o ‘clock position, the included Angle of the tangent line between the welding rod and the welding direction tube is 90°. 4) In the vertical climbing welding position, that is, the position of clock 10-11 during the welding process, the included Angle of the tangent line between the welding rod and the welding direction tube is 85-90°. 5) In the flat welding position, that is, at 12 o ‘clock of the clock, the included Angle of the tangent line between the electrode and the welding direction tube 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