对钢管预热温度不易达到温度要求及温度降低快的现象，在喷砂除锈完成后，设

The preheating temperature of the steel pipe is not easy to meet the temperature requirements and the temperature drops quickly. After the sandblasting and rust removal are completed, a special person shall be used to heat the surface of the pipe uniformly in advance with a roasting handle. , Then move to the next port for preheating in advance. In order to offset the failure of heat dissipation in low temperature environment, when the butt weld is preheated, the upper limit of the preheating temperature should be reached. The temperature control is measured by an infrared thermometer, and 8 points are measured along the circumference.

The warm-up temperature of the steel pipe is not easy to reach the temperature requirements and the phenomenon of rapid temperature reduction, after the completion of sand blasting rust removal, set up a special person in advance with a baking put to the pipe surface continuously and evenly heated, when the anti-corrosion worker to carry out the anti-corrosion filling operation of the weld, and then move to the next port to preheat in advance. In order to offset the heat dispersion failure in low temperature environment, when preheating the weld, the upper limit of the preheat temperature requirement should be reached, the temperature control is measured by infrared thermometer, and 8 points are measured along the circumference.

For the phenomenon that the preheating temperature of the steel pipe is not easy to meet the temperature requirements and the temperature drops rapidly, a special person shall be assigned to heat the pipe surface continuously and evenly with the baking handle after the sand blasting and rust removal is completed. When the anti-corrosion workers carry out the anti-corrosion joint repair work of the welding joint, they will move to the next pass for preheating in advance. In order to counteract the heat loss effect in low temperature environment, the upper limit of preheating temperature should be reached when preheating the welding joint. The temperature control is measured by infrared thermometer, and 8 points are measured along the circumference<br>