Purging Stainless Steel Pipe For Welding

purging stainless steel pipe for welding
1. Gather the necessary equipment: You will need a purge system, which typically consists of a gas cylinder, flowmeter, hoses, and a purge dam or plug. The gas used for purging is usually argon or a mixture of argon and helium.

2. Prepare the pipe: Clean the inside of the pipe thoroughly to remove any dirt, oil, or debris that could contaminate the weld. Use a wire brush or abrasive pad to remove any scale or oxidation.

3. Determine the purge volume: Calculate the volume of the pipe that needs to be purged. This will depend on the pipe diameter and length. Consult welding codes or standards for specific requirements.

4. Set up the purge system: Connect the gas cylinder to the flowmeter and then to the purge dam or plug. Ensure all connections are secure and leak-free. Adjust the flowmeter to the required purge gas flow rate.

5. Position the purge dam or plug: Place the purge dam or plug at the end of the pipe and seal it tightly. The dam or plug should completely seal off the pipe to create a confined space for the purge gas.

6. Start purging: Open the gas cylinder valve slowly to allow the purge gas to flow into the pipe. Monitor the flowmeter to ensure the desired flow rate is maintained. The purge gas should displace the air inside the pipe.

7. Monitor oxygen levels: Use an oxygen analyzer to measure the oxygen content inside the pipe. The oxygen level should be kept below the specified limit, typically below 100 parts per million (ppm) or as specified by welding codes.

8. Welding: Once the desired oxygen level is achieved, start the welding process. The purging gas should continue to flow during welding to maintain a protective atmosphere inside the pipe.

9. Post-weld purging: After welding is complete, continue purging for a period of time to cool the weld and prevent oxidation. The duration of post-weld purging will depend on the pipe size and thickness.

10. Inspect the weld: After purging, inspect the weld for any defects or signs of contamination. If necessary, perform further cleaning or post-weld treatments to ensure the weld meets quality standards.

Note: It is important to follow welding codes, standards, and manufacturer's recommendations for purging stainless steel pipe, as specific requirements may vary depending on the application and material being welded.

Related definitions of stainless steel welded pipe

(1) Stainless steel welded pipe definition

Welded steel pipe referred to as welded pipe, commonly used steel or steel strip after the unit and mold crimping molding welded steel.

(2) Characteristics of stainless steel welded pipe

First, the product is continuous online production, the thicker the wall thickness, the greater the investment in the unit and the melting equipment, the less economical and practical it is. The thinner the wall thickness, the lower the input-output ratio; Secondly, the process of the product determines its advantages and disadvantages. Generally, the welding steel pipe has high precision, uniform wall thickness, high external brightness inside the pipe (the surface brightness of the steel pipe determined by the surface grade of the steel plate), and can be arbitrarily measured. Therefore, it reflects its economy and aesthetics in high precision, medium and low pressure fluid applications.

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