Quality control of lsaw steel pipe during welding is: 1) According to welding procedure specifications wire and flux review is correct, to prevent misuse of welding wire and flux caused by the quality of the accident. 2) To supervise welding environment, take appropriate measures after welding when welding environment is not good (temperature below 0 ℃, relative humidity greater than 90%) should be. 3) Before the expected first test welding groove dimensions, including space, blunt edge, and whether the angle and the wrong port meet the technical requirements. 4) In the submerged arc welding process inside and outside the selected welding current, welding voltage, welding speed and other parameters are correct. 5) Supervision of personnel in the submerged arc welding inside and outside welded steel pipe full advantage of the end plate arc length, straight seam steel pipe to strengthen the efficiency of the welding arc when the inner and outer plates, which helps to improve the quality of welding the pipe ends. 6) Supervision of personnel in the welding slag welding whether they are first cleaned, whether you've completely processed joint groove at whether there is oil, rust, slag, water, paint and other contaminants.

LSAW steel pipe blank perforated temperature varies according to the raw material strange strange. Thermal expansion pipe but mostly in 1200 ℃, when the carbon content and other alloying elements more temperature slightly lower. The second key is to try to reduce the heating operation scale quantities. Especially in hot kneading elbow, 16Mn Longitudinal things from life expectancy and kneading the pipe surface quality leave, pleading even more severe. Longitudinal in the production process, since the primary process is in a hot state, so the heating operation is resolution product quality is very important process. The heat with the furnace, according to their results, and reheating furnace is divided into two kinds; the former is used to billet heated from room temperature to the processing temperature; the latter is used in the process in the blank reheated to the required processing temperature. Heating will be wrong in the outer surface of the tube surface may exhibit cracks, folds and migraine pain and other waste reason. Furnace There are many ways, but the primary use is a ring furnace. This furnace has an annular hearth, it can slowly change the direction of the diameter of the blank along the bottom of the load from the entrance, a reversal can be used at the outlet of the heating and soaking temperature to the rule kind of stove. This operation is the key blank is heated uniformly heated to a temperature suitable for processing. Because a great impact on the quality of the perforation, that is, when the temperature of the process piercing is an important condition affecting the quality, it is generally the temperature of the billet piercing working is to manipulate.

Hot-rolled steel slab continuous casting round tube or the slab as the raw material, the reheating furnace is heated, high-pressure water descaling into the roughing mill, roughing material by cutting head, tail, and then into the finishing mill, the implementation of computer-controlled rolling, finish rolling after via the laminar cooling and coiling coiling machine, become straight hair volume. straight hair volume head, tail and tongue were often fishtail, poor thickness, width, precision, while often the presence of wave-shaped section, folding, pyramid and other defects. The hot-rolled steel coil weight heavier, coil inner diameter of 760mm. (Pipe industry generally prefer to use.) The straight hair volume by the cutting head, cutting the end, cutting and multi-pass straightening, leveling of finishing line after the treatment, and then cutting board or heavy volume becomes: hot-rolled steel, flat hot-rolled coil, hot rolled and other products with slitting coil finishing descaled if pickled and oiled hot rolled Serve acid washer volumes.

1, LSAW steel pipe raw materials used by steel edge is another important reason for the poor condition of the wrong side of the result. 2, LSAW steel pipe with steel head and tail butt welding weld reinforcement material is large, when the over-molding, if not handled properly, likely to cause greater wrong side. 3, LSAW steel pipe raw materials used in steel due to the poor is not trimming the strip head and tail shape and dimensional accuracy, it could easily lead to the strip hard bend butt caused the wrong side. 4, LSAW steel pipe molding, steel camber angle will constantly change shape, leading to changes in the weld gap, resulting in open seam, wrong side or even take sides. Camber is caused by strip steel on the wrong side of the most important factors. Seriously affecting the quality of steel pipe.   In large diameter thick wall straight seam steel pipe production, the emergence of the wrong side of the case occurred when the Austrian Grand prompted the manufacturers to do for the way to deal with this phenomenon, try to improve their large diameter straight seam steel pipe quality, thus boosting sales.

(1)Welding time is shorter, about 1/2 of the ordinary friction welding, such as single-head drill Dagang Oilfield 127mmIEU pure welding time of about 30-50s, while inertia friction welding only 18-20s. (2)Friction welding in general would lose braking function, inertial brake friction welding no loss of kinetic energy, and short welding time, total energy consumption is smaller. (3)Since the counterweight on the spindle from the inertial mass storage effect, the power transmission device can be slightly less, while omitting a braking device, the equipment and its control system more streamlined. (4)Only three main process parameters, namely the spindle speed n, flywheel moment of inertia J and the top forging force f, when the above three parameters selected, the entire welding process can be automated, the welding process, the welding section temperature, friction torque, friction welding and shorten the amount of time varies with the three main parameters, the welding process easy to control. (5)Since the welding time, welding heat affected zone temperature gradient is steep, welding center section and solid body hardening risk of danger due to welding friction welding to be larger than normal. However, the drill pipe welding section is an annular cross-section, the center does not exist due to the danger of welding.