What Is ERW Steel Pipe

ERW pipe definition

Electric resistance welded pipe is produced by low frequency or high frequency resistance. ERW pipe has the characteristics of high strength and good durability, and is suitable for fluid transmission and other structural applications.

ERW pipe manufacturing process

ERW (electric resistance welded) pipe is made by cold forming flat steel plate into a cylinder and fusing the edges together by passing electricity. There are two main types of ERW process:

1. High frequency welding

Typical process of high frequency welding: uncoiling – strip straightening machine – head and tail cutting – strip butt – loop hopper – forming – welding – deburring – sizing – defects – flying shear – initial verification – pipe straightening – pipe processing – hydrostatic test – defect detection – printing and coating – finishing.

2. Rotating contact wheel welding

In rotating contact wheel welding, the current passes through the contact wheel at the welding point. This contact wheel applies part of the forging pressure required for the welding process.

Features of ERW steel pipe

- High production efficiency

- Low cost

- Save materials

- Easy to automate

ERW steel pipe standards

ASTM A53, ASTM A135, ASTM A178, ASTM A214, ASTM A250, ASTM A333, ASTM A334, ASTM A500, ASTM A501, ASTM A513, ASTM A523, ASTM A618, ASTM A795

EN 10208-1, EN 10208-2, EN 10217-1, EN 10217-2, EN 10217-3, EN 10217-4, EN 10217-5, EN 10217-6, EN 10224, EN 10255, EN 10288, EN 10296-1, EN 10305-2, EN 10305-3, EN 10305-6 DIN 30670 ISO 3183 API 5L

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