Weld joints: weld to weld junction known as the weld joints. Due to the limit the end of the electrode length, the joints of the weld before and after the two is inevitable, but the weld joints should strive for uniformity, and to prevent excessive weld joints, out of line width is inconsistent defects. Weld the joints of the following four categories:
1) middle connector: After welding the Welding Wire from the weld the rear of the first welding welding, require about 10mm before the crater near the arc, the arc length should be slightly longer than normal welding, and then back over the crater at suppress the arc and a short swing, and then forward the normal welding. This connection method is to use up to a suitable surface connector for single-layer welding and multi-pass welding.
2) contrary to the connector: The beginning of the two welds phase, requiring first the weld start slightly lower After welding the weld must be in the front end of the weld began slightly before at the arc, then slightly elongated arc arc gradually lead forward the beginning of the weld side, and cover the front end of the weld to be welded flat, and then the welding direction.
3) opposite the connector: This is the ending phase of the two welds, weld after welding to weld the weld when closing the arc at the welding speed a little bit slower, to be filled pit of the first weld to the faster speed and then slightly forward welding for some, and then extinction.
4) above retirement welding head: This is the beginning of the weld before welding and after welding the finishing phase, request weld close to the first weld the beginning, you should change the electrode angle, electrode point before the weld back-end, the elongated arc, upon the formation of molten pool, and then depress the arc, move back, and finally back to the original bath at Crater. Connector flat or not, and welders operating techniques, and also with the temperature level of the joints. Temperatures are high, then the more smooth. Therefore, the middle joints arc off time is shorter, faster action to change electrode. Multi-layer welding, the layer indirect head had to be staggered in order to improve the compactness of the weld.
In addition to the weld of the middle joints from time to clean up the welding slag, the remaining joints must first need to joints prior to welding slag removed, otherwise pick a bad weld joints, if necessary, the joints will need to hit ground bevel and then connector.
Welds Finish: The finishing of the weld is a weld after Crater. The end of welding, to do the finishing of the weld. Ending when they maintain the bath temperature in order to facilitate the weld joints. The ending in different ways, have repeatedly broken arc ending France, circled finishing method, the reflow finishing law and the transfer finishing law. Forming one-side welding, the weld finishing the main method of repeatedly breaking the arc ending France and back to the weld finishing. Repeatedly broken this small arc method generally used for acid electrode weld finishing, the reflow ending rule used for the alkaline electrode weld finishing touches, if the arc suddenly go off, the weld surface leaving sunken crater, reduce welding seam ending at the strength, and easily lead to the crater cracks. If finishing quickly pull off the arc, the gas in the liquid metal is too late to escape, but also prone to holes and other defects. In order to overcome the defects of the crater, and may use the following method ending:
1) repeatedly breaking the arc finishing method: repeatedly at the crater when the electrode to move to weld the end of extinction, the arc several times until it fills the crater. This method is suitable for sheet and high-current Welding Rod, the weld finishing, but is not suitable for the finishing of the alkaline electrode.
2) Circle the finishing method: when the electrode moved to weld the end of, at the crater circle movement, until it fills the crater and then pull off the arc, this method is suitable for thick plate finishing.
3) transfer of finishing method: when the electrode moved to weld the end of a brief stopover at the crater, the arc slowly raise, and then diverted to the weld edge of the base metal groove. At this time the bath will be gradually reduced, after solidification is generally not a defect. Replacement of electrodes or temporary stop of the ending of the arc.