Welding skills and quality control of welded steel pipes

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Introduction
Welded steel pipes are widely used in the fields of fluid transportation, structural engineering, etc. due to their high manufacturing efficiency and low production cost. However, quality control in the welding process is crucial. Any carelessness may lead to weld defects and affect the service life of the pipeline. This article will explore the welding skills and quality control measures of welded steel pipes to ensure that the welding quality meets industry standards.

1. Welding skills of welded steel pipes
The welding quality of welded steel pipes depends on many factors, such as welding methods, welding materials, welding parameters and welding processes. The following are key welding skills:

Groove preparation and assembly

Before welding the steel pipe, the appropriate groove form should be selected according to the thickness of the pipe wall, such as single V groove, X groove, etc.
Ensure that the gap between the pipes is uniform and the misalignment is controlled within the allowable range to ensure welding penetration.
Reasonable selection of welding methods

For thin-walled steel pipes, TIG (tungsten inert gas arc welding) can be used to avoid welding penetration and overheating deformation.
Thick-walled pipes can use MIG/MAG (metal arc welding) or submerged arc welding to improve welding efficiency and quality.
ERW (resistance welding) is often used for longitudinal seam welding to ensure weld density and mechanical strength.
Optimization of welding parameters

Select appropriate welding current, voltage, and welding speed according to the material and welding method.
Control welding heat input to avoid structural embrittlement or welding cracks caused by overheating.
In multi-layer welding, ensure good fusion between welds to avoid slag inclusions and unfused defects.
Operation skills during welding

Use stable arc welding to prevent uneven weld formation.
In longitudinal seam welding, use an automatic tracking system to maintain consistent weld quality.
Use a reasonable welding sequence, such as welding from the inside to the outside, to reduce welding stress and deformation.

2. Quality control of welded steel pipes
In order to ensure the quality of welded steel pipes, the following links need to be strictly controlled during the production process:
Inspection before welding
Check whether the steel pipe material meets the standards and whether there are defects such as cracks, inclusions, and rust.
Welding materials (welding wire, flux, welding rod) should meet the corresponding standards and be dried.
Equipment status check to ensure that the welding machine works stably, and gas shielded welding needs to ensure stable gas flow.

Welding process control
Use automated welding equipment to improve weld consistency.
Monitor welding temperature to avoid cracks caused by excessive welding stress.
Use online detection technology, such as ultrasonic flaw detection, to detect weld defects in real time.

Post-weld quality inspection
Perform X-ray or ultrasonic flaw detection to ensure that the weld is free of cracks, pores, unfused and other defects.
Pressure test high-stress pipelines to ensure that the weld strength meets the standards.
Repair the weld when necessary to ensure that the product meets the use requirements.

Conclusion
The welding skills and quality control of welded steel pipes are the key to ensuring product reliability. By optimizing the welding process, reasonably selecting the welding method, strictly controlling the welding parameters, and strengthening quality inspection, the performance of welded steel pipes can be effectively improved to meet the needs of various application scenarios.

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