18 Years Factory Jewelry Wire Roller - Roll Repair Submerged Arc Welding – Runxiang

Roll repair submerged arc welding is a strong welding arc buried welding method, natural in the welding process can not see the arc, and most of the automatic welding, labor conditions are greatly improved. Submerged arc welding, the principle of selecting the welding specification is: to ensure a stable burning arc, weld shape and size to meet the requirements, the surface is formed smooth and neat, no internal pores, slag, cracks, not weld through, weld tumor and other defects. Commonly used selection methods are table method, test method, empirical method, calculation method. Regardless of which method is used to determine the parameters, must be corrected in the application of welding, to achieve the most effective when continuous welding.

According to the applicable current range of monofilament Submerged arc welding, when the plate thickness is less than 14mm, you can not open the bevel, assembly with a certain gap; plate thickness 14 ~ 22mm, generally open V-shaped bevel; plate thickness 22 ~ 50mm, open X-shaped bevel; for boiler gas ladle and other pressure vessels usually use U-shaped or double U-shaped bevel, to ensure that the bottom layer of weld through and eliminate slag. Bevel processing methods often use edge planing machine and gas cutting machine, there should be a certain degree of processing accuracy. For straight seam joints should be added at both ends of the arc-priming plate and arc-extinguishing plate, in order to reduce the arc-priming and lead-out defects.

For spot welding after the welded parts, generally to increase the working temperature or sandblasting and other methods to ensure the quality of welding.

In submerged arc welding, it is generally necessary to adjust the welding current with automatic arc voltage matching. The factors affecting the welding current are: plate thickness, welding speed, wire diameter, etc.

Welding technology for butt straight seam welding

The welding methods for butt straight seam welding are: single-sided welding and double-sided welding; single-layer welding and multi-layer welding; liner pad method and linerless method. Flux pad method submerged arc automatic welding, which is to prevent the leakage of slag and molten pool metal, to use a larger welding specification is the weld penetration to achieve double-sided forming. Manual welding capping submerged arc automatic welding, for welding seams that can not use a liner, can first manual welding capping and then submerged arc welding. Overhead welding, for no bevel, no gap butt welding, he does not use any liner assembly gap requirements are very strict. In order to ensure that the weld penetration, front welding to weld through 40 to 50%, back welding must ensure that the weld penetration of 60 to 70%. In practice it is generally difficult to measure the depth of melt, usually by observing the color of the back of the molten pool to judge and estimate, so to have some experience. Multi-layer submerged arc welding, for thick steel plate to use multi-layer welding, the bottom layer of welding specifications to be smaller, both to ensure that the weld penetration, but also to avoid cracking and other defects. Each layer of the weld joints should be staggered not to overlap.

Butt ring seam welding technology

The submerged arc welding of the butt ring seam of the circular cylinder should be done with a roller tire with a speed control device. If double-sided welding is required, a flux pad must be placed at the outer wall weld of the cylinder below for the first pass. Fix the welding trolley on the cantilever frame and reach down to the barrel to weld flat. Weld wire offset centerline under the slope welding position on. The second frontal welding is done outside the barrel, at the upper flat welding.

Cross-joint welding technology

For T-joints and lap joints, two forms of ship-shaped welding or bevel angle welding are generally used, and for flat angle welding, the angle between the wire and the web is best kept at 20 to 30°

Submerged arc semi-automatic welding

Submerged arc semi-automatic welding is generally used with wire below 2mm, mainly for fillet welds, but also for butt welds.