First, what are the pretreatment procedures for plastic-coated steel pipes?
Plastic-coated steel pipes typically refer to double-sided plastic coating, also known as internal and external plastic-coated steel pipes. For plastic-coated steel pipes, the initial rust removal technology plays a crucial role in the quality of the finished pipe. Therefore, when selecting newly arrived steel pipes, galvanizing is not required, but rust must be removed. Any remaining rust spots inside the pipe must also be thoroughly cleaned. The rust removal should meet the St2 or Sa1 level requirements for electric rust removal. To remove oil stains from the surface of the steel pipe, acetone can be used for cleaning.

Second, what are the precautions for welding plastic-coated steel pipes?
The wide range of applications of plastic-coated steel pipes has brought them significant development opportunities. With the increasing demand for plastic-coated steel pipes, manufacturers have sprung up like mushrooms after rain. The arrival of a new era for plastic-coated steel pipes, coupled with the continuous strengthening of people’s environmental awareness, has ushered in a new stage of rapid development for the plastic-coated steel pipe industry. Plastic-coated steel pipes are high-quality products that are environmentally friendly, energy-saving, corrosion-resistant, and flame-retardant. It is recommended to leave a 150mm long bare pipe at the joint of the plastic-coated steel pipe when welding (mainly to prevent corrosion between processes so that a high-temperature resistant and rust-proof primer can be applied). This will prevent the plastic coating from being burned during welding. After welding, if the quality is qualified, the weld and the reserved 300mm pipe end can be treated with anti-corrosion by wrapping with plastic bags, shrink tape, or flame spraying.