Characteristics of an overhead welding operation
Plate butt welding Yang plate specimen difficult welding position, the examination of the various types of welders game project, do not use power tools, general requirements for welding adds to the difficulty of welding. Welding, welders sight is not good, the molten pool is difficult to observe; molten iron is easy to fall by gravity. Back bead prone to depression, and the positive weld defects such as undercut and ultra easy to produce.
2 electrode process performance and use characteristics of
E5015 electrodes belonging to the low-hydrogen electrodes. Welding, the droplet was particulate transition, an arc is not stable enough, the poor coverage of the slag, prone stomatal slag defects. Therefore, before welding, in addition to the clean-up of the base metal, electrode according to the provisions of drying outside their operating skills can be attributed to the following key points: big line; the ultrashort arc; slow motion; sides of the weld stays; noted cited ending arc Connector skills.
2.1 big line. Welding, selected the appropriate process parameters, Welding Wire Chinaspeed should be appropriate to slow down, an appropriate extension of the molten pool there is a time, and is conducive to the the slag floats and bubbles in the molten pool overflow. Avoid folder slag and stomatal generation, but also conducive to the stable protective atmosphere around in the pool.
2.2 Ultrashort arc. Must be short arc welding process, the molten bath of hot metal arc blowing force is holding hung upside down, on the other hand, the basic electrode arc is not stable enough, easy to make the air drawn into the welding zone, the formation of pores. Short arc welding, the arc stability can be improved, and this is the basic electrode basic operating specifications.
2.3 in slow motion. Mainly refers to the the transport bar operation slow, steady, so that the molten pool is always the arc shadow. Electrode lateral swing, the arc moves toward the other side from the one side of the weld bead to be smooth, so that the molten pool always with arc moving. Doing so, not only to improve the protective effect of the molten pool to prevent air drawn into, and can weld forming uniform fine.
2.4 on both sides of the groove stays. Both sides of the groove as appropriate, sufficient residence to foot hot metal on both sides to prevent undercut.
2.5 Note cited, the closing arc and joints skills. Arc, arc resumption and the connector operation have a significant impact on the quality ofMig Welding Electrodes. Arc Preheat the arc at the weld fusion can avoid slag defects. Correct closing arc to avoid deep crater and crater cracks. Generally the back welding, drawcircle, ending arc, should not suddenly pull off the arc. To scratch the arc is appropriate connector, in front of the weld electrode end of the first drop of molten iron deficiency slag protection, its cladding in not welding welding trail, avoid directly into the formal weld avoid blowholes