3.1 main cold and on the connection of welding as far as possible with two people welding, preheating temperature and interlayer temperature control, welding shall be ventilated, the use of pumping, other containers with stainless steel composite pad plate of single-sided welding, preheating temperature and interlayer temperature is similarly controlled at about 1 ℃,.
3.2 argon arc welding nitrogen cylinder shall be placed nearby, preferably not more than 6 meters gas pipe the shorter the better, if the gas pipe is too long easy to bring in air, nitrogen, welding seam easy to produce bubbles and other phenomena, affecting the quality of welding both
3.3 In the case of air humidity greater than 8 (cloudy and rainy days, foggy weather) aluminum welding is not allowed.
3.4 butt grouping when the wrong side of the amount to be uniform, wrong side control in 5 wall thickness or less
3.5 aluminum tower butt, welding process must monitor the verticality of the tower, verticality can be adjusted according to the different orientation of the welding