Submerged Arc High Frequency Welded Pipe Straight Seam Type Water Resistant

Product Specification

Straight Seam Welded Steel Pipe High Frequency Submerged Arc Welding Pipe

Product Description

1.HIGH-FREQUENCY WELDING is a welding process in which the heat source used to melt the joining surfaces is obtained from high-frequency (HF) alternating current (ac) resistance heating.

2.The high-frequency induction (HFI) resistance pressure welding technique for longitudinal welding. The endless strip passes through rolling stands where it is shaped to an open pipe, which runs through a high-frequency inductor consisting of a metal coil with single or multiple windings. As a result, high-frequency ring current is induced into the pipe that closes preferably at the strip edges which converge in the welding point. The temperature required for welding is generated by resistance heating of a narrow zone along the strip edges.

3.The heated strip edges are squeezed together by pressure rollers, resulting in a homogeneous longitudinal weld without any filler metals. The flash generated on the inside and outside surfaces during welding is scraped off to the level of the pipe surface with special tools.

4.Immediately afterwards, the HFI weld is subjected to a multi-step inductive annealing treatment to ensure that the properties in the weld area match those of the base material. Then the continuous pipe string is straightened, size rolled and finally cut to length by a flying saw.

5.Coil edges are milled using carbide cutters in order to assure a high quality weld. Coils are then formed by cold forming method using a set of cage rolls and fin passes, and then joined using high frequency currents using induction or alternatively conduction methods.

6.The process begins with the cutting of the strip of the required size on slitting line and then fed through the Tube Mill for formation of line pipe. Once the formation of pipe is done, it is passed through the high frequency welder where the edges are welded together.

7.During the process of welding, because of immense generation of heat, there is formation of beads on both the edges, inside and outside the pipes. These beads are then cut in order to have unrestricted flow of fluid/gas inside the pipe.

8.Thereafter, pipes are cut into the required length and are transferred to finishing sections for further processing and testing of the line pipes like straightening, End Chamfering/Facing, Hydro-testing, Non-destructive Testing, Threading, Galvanizing etc., depending on the requirement of the customer.

Typical process of high frequency welded pipe:

Slitting --- Uncoiling --- Strip leveling --- Head and tail shearing --- Butt welding of steel --- Storage material----Forming ----Welding --- Deburring --- Sizing --- flaw detection --- flying cutting --- initial inspection --- steel pipe straightening --- pipe section processing --- hydraulic pressure test --- flaw detection --- printing and coating --- the finished product.

Specifications

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Company Advantage

1. Liantai is dedicated in providing and exporting competitive welded steel pipes and fittings in various steel grade.
2. Our company maintains dose relations with numerous large steel strip suppliers and Steel.
3. Cost effective: Competitive prices with factory directly supply
4. We have an experienced,professional and hardworking team to help you find the best purchase solution.
5. All for users throughout the whole process of economic management, for this purpose, to provide customers with high-quality products and excellent services.
6. She will provide good -quality products and best services for you at prime of principle: First Quality,
7. Best Frame. Sincerely have an opportunity to cooperate with all customers.
8. We are able to maintain high quality standards through our committed personnel and sound infrastructure.
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FAQ

Q. What is the thickness range of the product?
A. 0.25mm-2.5mm.

Q. What is the zinc content on the surface of the product?
A. In the case of no special customization, the general is 40-50 grams.

Q. Are you trading company or manufacturer ?
A. Yes. We are a factory for steel pipe but we also do some another steel products galvanized coil cold rolled coil galvanized strip steel sheet, and etc.. if you havedetailed spec or drawing. Our production lead time is within 30-45 days.

Q. How can I get your quotation as soon as possible ?
A: The email and fax will be checked in 24 hours. Please tell us the order information about quantity.Specification (steel type, material,size ),and destination port,you will get the latest price.

Q: Can we visit your factory to inspect the goods for the order?
A : Welcome to visit our factory to inspect the quality.We sincerely hope to establish a honest business relationship.

Q: How about the quality of products in your company?
A: We have high and best quality products and our products get some good feedbacks from clients all over the world. Once you got our products with some questions under guarantee, we will provide helps at first place.