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What are the classifications of automatic variable diameter roll welding machines?
Publish Time：
2022-06-17 09:50
A roll welding machine is a machine used for roll welding. Roll welding, also known as ring welding, is a method in which a pair of roller electrodes replace the spot welding cylindrical electrodes. The workpiece is moved between the rollers to produce a sealed weld seam with overlapping molten cores. So, what are the classifications of automatic variable diameter roll welding machines?
What are the classifications of automatic variable diameter roll welding machines?
A roll welding machine is a machine used for roll welding. Roll welding, also known as ring welding, is a method in which a pair of roller electrodes replace the spot welding cylindrical electrodes. The workpiece is moved between the rollers to produce a hermetically sealed weld seam with overlapping molten cores. So, what are the classifications of automatic variable diameter roll welding machines?
What are the classifications of automatic variable diameter roll welding machines?
1. According to the different roller rotations:
(1) Continuous roll welding: In continuous roll welding, the workpiece moves continuously between the two rollers, and the welding current also passes through the workpiece continuously.
(2) Intermittent roll welding: In intermittent roll welding, the rollers rotate continuously, the workpiece moves continuously, and the current intermittently passes through the workpiece. During intermittent roll welding, the rollers have already left the welding area when the molten core cools, lacking sufficient forging. The molten core crystallizes when the pressure decreases, easily leading to surface overheating, shrinkage pores, and cracks.
(3) Step-by-step roll welding: In step-by-step roll welding, the rollers rotate intermittently, and the current passes through the workpiece when stationary. This method is often used for welding aluminum-magnesium alloys and seam welding high-temperature alloys, and it can also effectively improve the welding quality. However, this type of roll welding requires complex mechanical devices to make the rollers rotate intermittently.
2. According to the different joint forms:
(1) Lap roll welding: Similar to spot welding. Lap welding can be performed using a pair of rollers or one roller and a core shaft electrode. The small lap amount is the same as spot welding. In addition to double-sided roll welding, lap welding usually includes single-sided single-seam roll welding, single-sided double-seam roll welding, and small-diameter circumferential roll welding. Single-sided roll welding can be used when the plate is wider or other reasons restrict the coil from approaching the workpiece from both sides. When welding small parts such as mounting brackets to the surface of large parts and certain airtightness is required, roll welding can be performed by rolling around the periphery of the vertically placed coil.
(2) The lap joint during roll welding is much smaller than that during general roll welding, approximately 1 to 1.5 times the plate thickness.
(3) To save metal, reduce weight, reduce deformation of the welded structure, and improve fatigue strength, foil can be used as a pad for butt welding. The foil used can be stainless steel or titanium alloy foil, or the same metal.
(4) Copper wire electrode roll welding is an effective method to solve the problem of coating sticking to the roller during roll welding of coated steel plates. During the welding process, the round copper wire is continuously fed between the roller and the plate. The copper wire is continuously fed in its original state, then continuously unwound after passing through the roller without contaminating the roller. 5. When welding corrugated pipes and bellows, due to the thinness of the parts, small stiffness, and narrow welding space, auxiliary fixtures are often used for roll welding. Usually, the fixture is made of copper alloy to ensure good conductivity and heat dissipation.
What is the principle of an automatic variable diameter roll welding machine?
1. Adjustable stroke cylinders are used for pressurization to avoid collision and damage to the upper and lower electrodes.
2. Three-phase stepless speed regulation electrode drive is used, making the welding speed adjustment convenient and stable. The ingenious internal structure reduces the welding performance caused by heat generation, weakens the good contact between the silver bushing and the rotating conductor, and reduces the energy conversion loss to a very low level.
Automatic diameter change roll welding machine
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