The production process of the petro-chemical industry is characterized by high pressure, high temperature, flamability, explosivity, deep cooling and corrosion.

• 石化工业生产工艺过程具有高温、高压、易燃、易爆、深冷、腐蚀的特点，对焊接技术提出了多钢种、多工艺、高质量、严管理的要求。