Number of recruits：
a. More than 2 years of welding experience for industrial pipelines, boilers or pressure vessels (chemical/pharmaceutical industry);
b. be good at argon arc welding, manual metal-arc welding and submerged arc welding;
c. personnel having welding experience of special material pipelines and containers (titanium and titanium alloy, nickel and nickel alloy, duplex stainless steel, zirconium, etc.) is preferred; d. the qualification rate of flaw detection is not less than 95%.