Welded Pipes

The global market for Continuous Welded Pipes and Tubes is projected to reach 24 million tons by 2022, driven by the rise in investments in industrial projects and water infrastructure projects in developing countries. The growth in the market is also driven by the need to replace aging pipelines in developed economies of the U.S. and Europe; and new emerging applications in fire sprinkler systems, and agricultural sprinkling systems. Asia-Pacific represents the largest and the fastest growing market worldwide, led by factors such as rapid urbanization, growing focus on urban water security and the ensuing expansion of water supply networks; healthy pace of industrialization and the resulting investments in pipelines for industrial water and wastewater management and focus on irrigated agriculture in a bid to ensure food security and the ensuing popularity of pressure piped irrigation techniques.

(This article comes from Global Industry Analysts editor released)

What is SSAW Steel Pipe?

Spiral submerged-arc welding is a process of welding steel pipes, industry insiders always regard SSAW as the spiral submerged-arc welding steel pipe.The SSAW API steel pipe use a narrow billet and produces large diameter pipe, and you can also use the same width billets to produce different diameter pipes. The production cost is lower and it’s process is simple. It is generally used in metal structures, welded pipes for fluid transport, foundation, and some other structures. It is used in power industry, and urban construction. It is one of the China’s 20 key developed products.

The SSAW API steel pipe uses steel coil strip as row materials, after extrusion molding in normal atmospheric temperature, uses the automatic double wires and double side submerged arc welding process to weld steel pipes. The production processes are:

  1. The materials are steel strip, welding flux and welding wire.
  2. Before using, they must go through rigorous physical and chemical tests.
  3. The strip steel should use automatic submerged welding after the steel rolled into steel pipe.
  4. Before molding, the strip goes though flattening, cutting, trimming, planning, surface cleaning, transportation and edge curved processes.
  5. Use electrical contacts to control the cylinder pressure on both sides of the conveyor, that will ensure the strip deliver smoothly.
  6. Use the weld gap control can ensure the weld gaps to meet the welding’s requirements, the wrong side,the diameter, and weld gap should have been controlled strictly.
  7. Outside and the inner welding use the welding machine for single or double wire submerged arc welding.
  8. All the finished welds should go through the online continuous ultrasonic injury check, it will help to get the 100% welds non-destructive testing coverage. If there is any defective, it will alarm automatically and spray markers, production workers can adjust the process parameters at any time, and they can eliminate the defects timely.
  9. Using air plasma cutting machine to cut the steel pipe to single one.
  10. After the steel pipe into single pipes, each batch will go through the strict inspection system and the DNT inspection, to check the welds’ mechanical properties, chemical composition, fusion status, steel surface quality, only all the pipes’ process are qualified, can they be formally put into production.
  11. If there is a continuous acoustic detection marker on the weld, this pipe need manual ultrasonic and X-ray review, if the defective is true, after repairing, it need non-destructive testing again until the defect has been eliminated.

(This article comes from southlandpipe edit released)

Welded Pipe vs. Seamless Pipe

Welded vs. seamless. It’s a debate that’s been around for a long time, and it’s still going strong today.

So when your next project arrives, what side of the debate will you fall on? Will you choose a welded steel pipe, a welded carbon pipe? Or will you go with one of their seamless counterparts?

Here are some of the advantages of both types of pipes to help you make your decision.

Advantages Of Welded

  • Welded pipes are typically more cost effective than their seamless equivalents.
  • Welded pipes are usually more readily available than seamless. The longer lead time required for seamless pipes can not only make timing problematic, but it also allows more time for the price of the materials to fluctuate.
  • The wall thickness of welded pipes is generally more consistent than that of seamless pipes.
  • The internal surface of welded tubes can be checked before manufacturing, which isn’t possible with seamless.

Advantages Of Seamless

  • The main perceived advantage of seamless pipes is that they don’t have a weld seam. Traditionally, the seam of welded pipes has been viewed as a weak spot, vulnerable to failure and corrosion. For many years, this fear was probably justified. However, in recent years improvements in the manufacturing process for welded steel pipes and other welded pipes have boosted the strength and performance of the weld seam to levels indistinguishable from that of the rest of the pipe.
  • Seamless pipes provide peace of mind. Although there should be no issues with the seams of welded pipes supplied by reputable manufacturers, seamless pipes prevent any possibility of a weak seam.
  • Seamless pipes have better ovality, or roundness, than welded pipes.

(This article comes from St. Louis Pipe & Supply editor released)