Common Defects And Prevention Of Spiral Welded Seam
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Pre-finish welding technology is a thick-walled large-diameter spiral welded pipe production of oil and gas pipelines in the more advanced technology. The first step in the use of pre-finish welding production of spiral welded steel strip after the molding machine in continuous gas shielded arc welding welding.

Tube after welding along with pre-plasma cutting machine cut into a predetermined length of steel pipe, the second step is to pre-welded steel pipe after finish welding production line delivered to internal and external multi-wire submerged arc welding fine, spiral pipe welding two pre-finishing step production technology compared with the traditional one-step, has obvious advantages, pre-finish welding spiral welded pipe submerged arc welding production due to the speed of the shackles of the forming and welding separately, effectively solve the problem of mutual interference between the forming and welding full use of their forming and welding characteristics, to achieve the combination of high-speed multi-unit forming and welding, making a molding production line can produce many fine welding line welded steel pipe is to be provided, thereby greatly improving the production efficiency.

Further, since the pipe forming and submerged arc welding fine separately, on both sides of the pre-groove pipe after welding is relatively stable, easy to obtain high-quality welds.

And compared to the traditional one-step, two-step method of the main features as follows, due to the welding process from molding to contain the molding process parameters can be optimized, so that more precise geometry of the steel pipe, steel pipe roundness and straightness Yao diameter precision a higher degree. extensive use of straight seam submerged arc welding process in an effective way pipe manufacturing, steel quality improved, narrowing the LSAW pipe manufacturing variation between. productivity doubled, since two-step process molding process and the welding process separation, greatly improving the forming speed, forming speed may be three times the welding speed of up to 12m / min, 1 molding machines can be three finish welding production lines provided to be welded steel pipes, with an annual capacity available 200,000, allowing precise adjustment of rebound of steel needed to reduce the residual stress of ssaw steel pipe.

Steel finish welding is a static welding is generally not prone to cracking, if crystallization crack crack was caused by the welding wire can be excessive, because the weld cracks are generally due to the outer groove weld size is too large, the required filler metal more welding current is too large, resulting in welding wire can be excessive, and thus prone to weld solidification cracking, when the imaging probe post or hand positions cracks are found, further confirmation is required within or outside the weld welding crack crack, fine welding cracks generally outside welding cracks, confirmation method for the collection of the sample pickling or welding gouging prevention is to reduce welding heat, which reduces the outer welding wire 1 welding current and arc voltage, reducing the outer welding eccentricity increase dry outer welding wire elongation.


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