Beveling

Beveled ends can be processed into various angles and shapes according to the welding requirements, pipe specifications, and material characteristics, so as to achieve better welding seam quality. The common beveled ends for butt joints are as follows:

1. I-Type Butt Joint 
The I-type butt joint is a simple bevel type with no obvious bevel angle, and the two pipe ends are directly butted for welding. It is suitable for thin-walled pipes (wall thickness ≤ 3mm) or pipes with low welding strength requirements. It has the advantages of simple processing, high efficiency, and low cost, but it is only applicable to simple welding scenarios.

2. Single-V Beveled End
The single-V beveled end is the most commonly used bevel type, with a bevel angle of 30°-60° (usually 45°). It is suitable for medium-thick wall pipes (wall thickness 3-10mm), and has the advantages of simple processing, good welding operability, and full weld penetration. It is widely used in petroleum, chemical, and municipal pipeline projects.

3. Double-V Beveled End
The double-V beveled end is processed with V-shaped bevels on both the inner and outer sides of the pipe end, with a bevel angle of 30°-50°. It is suitable for thick-walled pipes (wall thickness > 10mm) or pipes with high welding strength requirements. The double-V shape can further increase the weld penetration depth, reduce welding stress, and improve the impact resistance of the weld seam, but the processing difficulty and cost are higher than those of the single-V beveled end.

4.Single-U Beveled End 
The single-U beveled end has a U-shaped groove, with a rounded bottom and a bevel angle of 20°-40°. It is suitable for thick-walled pipes and high-strength steel pipes. The U-shaped groove can reduce the amount of welding material, save welding time, and reduce welding deformation. At the same time, the rounded bottom can avoid stress concentration and improve the service life of the weld seam, but the processing requires professional equipment and high precision.

Our beveling processing strictly follows standardized procedures, with precise steps and strict quality control, ensuring the consistency and accuracy of each bevel. The specific steps are as follows:
- Pre-Processing Preparation: First, inspect the pipe or plate to be beveled, confirm the material, specifications, wall thickness, and welding requirements, and calculate the bevel angle, groove depth, and other key parameters according to the project drawings. Remove burrs, oxides, oil stains, and other impurities on the pipe end to avoid affecting the beveling effect and welding quality.
- Workpiece Fixing: Fix the workpiece on the professional beveling equipment (CNC beveling machine, portable beveling machine, etc.) using clamps, vises, and other fixing tools, and adjust the position to align with the processing center, ensuring that the workpiece does not shift during processing.
- Equipment Debugging: Debug the beveling equipment, set the preset bevel angle, groove depth, processing speed, and other parameters according to the calculated parameters, and test-run the equipment to ensure the normal operation of the equipment and the accuracy of the parameters.
- Beveling Execution: Start the equipment to perform beveling processing. During the processing, the operator continuously observes the beveling effect, adjusts the equipment parameters in time if there is any deviation, and ensures that the bevel surface is smooth, free of burrs, and the angle and depth meet the requirements.
- Post-Processing Inspection: After the beveling is completed, stop the equipment, take down the workpiece, and inspect the bevel angle, groove depth, blunt edge size, and surface finish. If unqualified, reprocess until it meets the standard.
- Post-Processing Treatment: For the beveled workpiece, perform deburring, cleaning, and other treatments if necessary, and mark the relevant parameters of the bevel to facilitate subsequent welding operations and quality traceability.

To ensure the safety of the processing process, the accuracy of the bevel, and the quality of the subsequent welding, the following precautions must be strictly observed during the beveling process:

Parameter Control: Strictly follow the project drawings and calculated parameters to set the bevel angle and groove depth, and avoid random adjustment of parameters, which may lead to unqualified bevel and affect welding quality.

Equipment Operation: Operators must be trained and certified before taking up the job, and strictly operate the beveling equipment in accordance with the operating procedures. It is forbidden to operate the equipment without authorization or modify the equipment parameters, and regular maintenance and inspection of the equipment are required.

Workpiece Protection: During processing, avoid scratching the surface of the workpiece, especially the bevel surface. For high-precision workpieces, take protective measures to ensure the surface quality of the bevel.

Safety Protection: Operators must wear personal protective equipment (gloves, goggles, protective clothing, etc.) during operation to avoid injury caused by debris splashing during beveling.

Quality Inspection: Conduct full-process quality inspection during beveling. For each batch of workpieces, sample inspection must be carried out to ensure that the bevel parameters meet the requirements. Unqualified workpieces are not allowed to enter the welding process.

Material Adaptation: For different materials (carbon steel, stainless steel, alloy steel), select the appropriate beveling equipment and processing parameters. For materials with high hardness, the processing speed should be appropriately reduced to avoid equipment damage or bevel defects.