Spiral shaped, double - submerged arc welding pipe production lines (Spiral Welding Pipe Mills) are our current hightlights. After many years of exploration and constant improvement, our pipe welding techniques, equipment and technologies already take the leading position in the country. Haokun has established the most solid and steady business relationship with the major pipe line manufacturing firms in China. The double -submerged arc spiral welding pipe mill of Φ 406~ 1422mmX80 we designed, manufactured for Yangzhou Tongya Pipe Co., Ltd has put into production successfully.

Our Spiral Welding Pipe Mills have formed a very diversified and serialized product range. In terms of forming process, our product lines consist of External Control Forming and Internal Control Forming. In terms of the mill production process, we have Looping Pit Stored Welding Material, or Backward Swing Machine Unit and Forward Swing Short Machine Unit in Welding Tractor style with continuous production capability. The pipe line products range from Φ219mm to Φ2800mm. All products meet the API - 5L, GB9711.1, GB9711.2 Standards.

Haokun also assists pipe line manufacturing firms in the layout, planning and design of products and manufacturing processes, and we also supply complete sets of equipment for spiral welding pipes production.