The quality of the welding process has a big influence on steel roof ridge vent. How to ensure the welding process of the ridge ventilator is a problem that every smoke vent manufacturer should think about.

First, the contractor shall conduct a welding procedure qualification for the steel, welding materials, welding methods, post-weld heat treatment, etc. it uses for the first time, and shall determine the welding procedure according to the qualification report. The welding procedure qualification should be carried out in accordance with the current national "Welding Regulations for Building Steel Structures" and "Welding Procedure Qualification for Steel Pressure Vessels".

Second, welders should pass an examination and obtain a certificate before they can engage in welding. The qualification certificate shall indicate the welding conditions and the validity period. Welders who have stopped welding for more than 6 months should be reassessed.

Third, do not use welding rods with peeling coatings or rusty cores, damp and agglomerated flux, and slag shells that have been melted during welding.

Fourth, the welding wire and welding nails should be cleaned of oil and rust before use.

Fifth, the welding electrode, flux and welding porcelain ring for studs should be baked according to the baking time and temperature specified in the product manual before use. The purity of the shielding gas should meet the requirements of welding procedure qualification. After baking, the low-hydrogen electrode should be put into the insulation cylinder and taken as needed.

Sixth, before welding, the welder should recheck the quality of the weldment joint and the treatment of the weld zone. When it does not meet the requirements, the conformity grid should be repaired before welding.

Seventh, for butt joints, T-shaped joints, corner joints, cross joints and other butt welds and butt and fillet combined welds, pilot arcs and lead plates should be provided at both ends of the weld. The material and groove form should be Same as weldment. The length of the arc starting and leading welds; submerged arc welding should be greater than 50mm; manual arc welding and gas shielded welding should be greater than 20mm. After welding, gas cutting should be used to cut off the pilot arc and lead-out plate, and be ground and smooth, and it is not allowed to be knocked down with a hammer.