Formulating a special technical processing-conical spiral weld pipe.

Based on the measurement, statistics and research to the garlic clove external characteristic parameters, an automatic orientation control device of tapered spiral seed pipe type is designed based on the friction features of garlic cloves and which adapts to the different physical features of various garlic cloves, its parameters and structure types are determined.

This article analyzes occurrence mechanism and reason of forming weld protruding of spiral submerged arc welded pipe and influence of peaking to protruding of steel pipe,and also put forward effective control method such as draw up the best process parameter,make steel plate edge shape norm,prebending steel plate edge to settle protruding problem.

In accordance with specialty of double wires welding process of inside welding for spiral submerged arc welded pipe,a set of internal welding double wires welding unit is developed.

Mathematical analysis for the diameter tolerance of spiral welded pipe;

Improvement upon the lubrication of forming rollers for spiral welded pipe;

In way of weld field,the article introduces application foreseeing of this technology,also discusses this technology application into 4 aspects:forming roller design and manufacturing,design of longitudinal welded pipe mill,the control of deform process and forming stress in longitudinal welded pipe in production,and the control of pipe residual stress in spiral welded pipe in production.

In order to satisfy the urgent requirement of large diameter line pipe with high quality, a study was made on the process of spiral pipe end expanding by means of FEM numerical simulation and experiment.

Based on the specialty of internal welding process of spiral pipes, a new intern al welding apparatus is developed for the spiral pipe welding.