Pressure vessels
Outer longitudinal and circumferential seams on thick-walled shells.
Narrow Gap SAW
DIG Narrow Gap SAW250 Welding System
Submerged arc welding of thick plate in grooves up to 250 mm deep
The DIG narrow gap SAW250 system welds thick plate in grooves up to 250 mm deep. It runs outer longitudinal and circumferential seams on pressure vessels and thick-walled shafts, on cylinders from Φ1200 mm outer diameter.
Manufactured byDIG
250 mmMax. weldable groove depth
Φ1200 mmMin. outer diameter of cylinder
18–50 mmGroove width, 1–3° single-side angle
Φ3–4 mmWelding wire diameter
≤0.20 mmLateral and height tracking accuracy
Overview
Narrow grooves, less filler
The SAW250 is a narrow-gap submerged arc welding system for thick plate. Compared with submerged arc welding on conventional grooves, the narrow groove needs less filler metal and less welding time.
Butt joints are 18–50 mm wide with a 1–3° single-side angle. The contact nozzle deflects ±3.5° from center with welding gun accuracy of ≤ ±0.5°, wire feed runs at 0.2–4 m/min, and the front wire reel holds at least 30 kg.
The first layer is welded in a single pass and the remaining layers in multiple passes. The workpiece can be up to 350 °C at the groove and the flux up to 125 °C. The tracking slide travels at least ±200 mm horizontally and 500 mm vertically, with ≤0.20 mm tracking accuracy.
Applications
Thick-plate welding jobs
DIG names these fields for the narrow gap SAW250 system.
Wind towers and boilers
Deep groove welds on heavy cylindrical sections.
Nuclear power and petrochemicals
Thick-plate welds with lower heat input for tougher weld metal.
Heavy machinery and shipbuilding
Thick-walled shaft workpieces and heavy plate joints.
Features
Technical features
- Groove depth up to 250 mm
- Wire diameter Φ3–4 mm, wire feed 0.2–4 m/min
- Contact nozzle deflection ±3.5° from center
- Welding gun deviation accuracy ≤ ±0.5°
- Two-way wire straightening accuracy ≤1 mm at 40 mm stick-out
- Front wire reel of 30 kg or more
- Tracking slide: ≥ ±200 mm horizontal, ≥500 mm vertical stroke
Benefits
What narrow gap welding brings
Less filler metal and shorter welding time
Lower heat input refines the weld metal and heat-affected zone
Better plasticity and toughness of the joint
Fully programmable control of the welding head
Operators kept away from hazardous positions
Welding thick-walled vessels or shafts?
Share your wall thickness, groove depth and diameters with our Machinery team, and we will check if the DIG narrow gap SAW250 system fits your job.
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