Circumferential welds of pressure vessels are the core guarantee for safe pressure bearing of air storage tanks. Tiny differences in craftsmanship directly determine the service life and safety of air tanks, so spot welding must be performed before full welding. Also known as positioning welding, spot welds serve as temporary fixing points. The core functions include dimension calibration, deformation control, falling prevention and ensure weld quality, it is an indispensable procedure for circumferential welds of pressure vessels.
Position and Fix Workpieces to Ensure Assembly Accuracy
Tank heads and bodies tend to slide and shift after hoisting and alignment, spot welds temporarily lock the two components together:
l Maintain concentricity between body and head to avoid excessive misalignment;
l Secure uniform groove clearance around the full circumference to meet pressure vessel welding specifications. If dimensional tolerance fails, spot welds can be ground off for re-alignment without reworking the entire circumferential weld.
Prevent Welding Deformation and Shifting Caused by Thermal Shrinkage
Continuous welding generates massive thermal shrinkage stress:
l Evenly distributed symmetrical spot welds form rigid support points to counteract shrinkage force during cooling;
l Avoid inward concave deformation of heads, out-of-round cylinders and opening/shifting of joints during welding, maintaining the circularity of finished tanks.
Prevent Falling for Safe Operation During Welding
When tanks rotate, flip or transfer on roller frames,spot welds hold the heads firmly to prevent falling and impact damage to equipment or safety incidents, compatible with continuous automatic circumferential welding.
Guarantee Welding Quality of Pressure-bearing Welds
l Stable groove clearance minimizes incomplete penetration, slag inclusion and burn-through during root pass welding;
l Spot welds fuse integrally with main welds to avoid scrapping the full circumferential weld due to joint misalignment mid-welding;
l Ovality and misalignment can be inspected after spot welding to correct assembly defects in advance.
From spot positioning, full welding, non-destructive testing to anti-corrosion spraying, all production procedures of YCZX air storage tanks are standardized by certified welders. We strictly control alignment precision between heads and cylinders as well as pressure-bearing performance of welds. Custom carbon steel, stainless steel and high-pressure air storage tanks are available as required, with complete certifications, stable delivery cycles and long-term after-sales support. If you require safe, durable and well-crafted industrial air storage tanks, please contact YCZX directly for customization and ordering. We will provide you with the optimal tank solution tailored to your working conditions.
