Skip to main content

Control of Welding Deformation of Crane Rail Square Steel

Control of Welding Deformation of Crane Rail Square Steel

The pre-padded height of the crane rail square steel bar end is determined according to the type of the rail, the length and the fixing condition, and the ambient temperature. The copper pad and the carbon steel plate are used to underlay the crane rail square bar end 30mm to 40mm. With the adapting pieces, like bolts and pressure plates, we can tighten the nuts to fix the crane rail steel square bar to the rail beams, and set at least 4 fixing points near each rail joint. After welding the bottom of the track, loosen the platen, lower the padded portion of the rail end to 20mm, and then tighten the platen nut. After welding the waist portion of the crane rail square steel, gradually reduce the height of the mat. After the rail waist portion is welded, all the shim plates should be removed and the pressure plate should be loosened. At this time, the rail joint should have small upturn value. During the welding process, whether to tighten the platen nut again depends on wether the rail is flat or not. During the entire welding process, the deformation of the rail joint must be checked at any time with a straight steel ruler, and the height of the joint and the tight pressure plate are adjusted at any time to control the deformation of the rail joint. When the rail joint is fixed before welding, the gap between the ends of the two rails is narrower than the upper and lower, which is based on the clearance at the bottom of the rail, not less than 12mm, and should not be too wide, generally controlled within the range of 15mm to 18mm. When the rail joint is fixed, in addition to ensuring the size of the end gap, it is necessary to align the ends of the two rails without any twisting or staggering.
Before welding and during welding, strict inspection should be carried out and the position of the center line of the two rails should be in a line to prevent the bending from being straight when the orbital welding is completed. When the rails fixed by the hook bolts are welded and the rail joints are welded, the above method can be referred to according to the specific conditions, and the temporary clamps are fixed to fix the rails for welding. The order of the welded rail joints is from bottom to top, the first rail bottom rail rear rail, the rail head, the layer by layer, and the last repair. The range of the two track ends is 40mm, and the preheating is carried out at the same time. The preheating and interlayer temperature are controlled at 300 °C to 350 °C. The first layer of welding, current 120A to 130A, to prevent the permanent carbon steel pad burning through and the copper pad melt, thereby reducing the difficulty of removing the copper pad, shortening the track air cooling time, in order to maintain the interlayer temperature and prevent quenching. In the future, (130±15)A can be used for each layer, and the welding slag must be removed before each layer can be welded.

Comments

Post a Comment

Popular posts from this blog

30 LB RAIL FOR SALE

  30 LB RAIL FOR SALE What is a 30 lb rail? A 30 lb rail refers to a rail weighing 30 lb in meters, which is an ASCE 30 model rail produced according to ASTM A1. As a common light track, it is mainly used for laying mining track lines. Therefore, it is widely used in the South American market. The dimensions of the 30 lb rail are as follows: Head width: 42.9mm Track height: 79.4mm Track bottom width: 79.4mm Waist thickness: 8.4mm GloryRail is an important  mining rail  supplier in China. Engaged in rail supply for more than 20 years. Rail products are exported to many countries and regions around the world. Trusted and supported by many mining customers. We maintain long-term cooperative relationships with many important customers in Peru, Colombia, Panama, and Venezuela in South America BUY 30 LB RAIL FROM CHINA As the world’s most important rail tracks production base. There are six major steel mills in China producing rails with an annual output of millions of tons. G...
Post a Comment
Read more

Welding Process of Overhead Crane Rail Joint

Welding Process of Overhead Crane Rail Joint In order to make the overhead crane rail transport more stable, rail splints will not be used for the overhead crane rail joint connection, but welded joint connection will be used. The main key to the welded joint is to solve the bending deformation and weld cracking of the overhead crane rail joint. During the welding process of the overhead crane rail joint, the overhead crane rail joint is deformed downwardly, so the overhead crane rail end must be padded to a certain height before welding to ensure that the rail joint can be kept straight after the welding is completed. The height of the rail end pad is determined by factors such as the type of rail, length, fixing method and ambient temperature. The rails are fixed to the crane beam by means of hook bolts, and each joint is provided with four fixed points. After the bottom of the rail is welded, reduce the height to 20mm, and then tighten the hook bolts to continue welding. When the o...
Post a Comment
Read more

Study on the Influence of 40×60 Crane Rail Plate Stres

Study on the Influence of 40×60 Crane Rail Plate Stress The main operation mode of the overhead crane is the orbital operation, that is, the wheel supports the whole crane and transmits the gravity to the lower 40×60 crane rail , and the 40×60 crane rail receives the concentrated pressure from the crane wheel and guides the wheel to run. Therefore, the track device is the direct load-bearing structure of the crane device. Usually, special rails that meet the requirements of the wheels are used as crane rails. These rails are fixed with the pressure plate and the structure of the plant. If the crane runs at a slow speed, the operating frequency is not high, and the wheel pressure is not large, this solution can still meet the requirements. However, if the crane is in a high-speed, frequent or large-wheel working environment, the existing fixing method cannot meet the performance requirements. At this time, the phenomenon that the rail press plate bolt is broken is extremely likely to ...
Post a Comment
Read more