Circumferential girth seams connecting cylinder body and end cap are Class B critical pressure-bearing welds of air receivers, which determine pressure safety, non-destructive testing (NDT) pass rate and long-term service life. Automatic gas shielded welding (MAG mixed gas metal active welding) is the mandatory standard process instead of manual arc welding or submerged arc welding, with the core reasons listed below:
1. Stable qualified welding quality
Locked fixed welding parameters eliminate human errors, delivering full penetration welds with few defects. It achieves high RT inspection pass rate and minimal tank deformation, fully complying with ASME & GB150 vessel codes.
2. Perfect for full-circle continuous welding
Rotary fixtures cooperate with welding torches to finish a full 360° seam in one pass, suitable for both carbon steel and stainless steel tanks, unlike position-limited submerged arc welding.
3. High mass production efficiency
Its welding speed is 2–3 times faster than manual welding, and smooth weld beads greatly cut post-weld grinding work.
4. Lower overall production cost
Continuous wire reduces material waste; only general operators are needed instead of senior certified welders, plus fewer reworks due to low defect rates.
5. Traceable records for export certification
All welding data can be saved to match WPS files, meeting traceability requirements of ASME U-stamp, CE, NR13 and other overseas certifications.
YCZX equips full-automatic MAG girth welding machines for all air receiver production lines. Every circumferential weld undergoes strict visual inspection and random radiographic testing to meet Chinese special equipment and global export certification standards, supporting customized air receivers of all volumes and materials.
