NARROW GAP SUBMERGED ARC WELDING

NARROW GAP SAW

Narrow Gap Submerged Arc Welding (SAW) is a high-efficiency welding process specifically designed for joining thick materials using a reduced groove width. Unlike conventional submerged arc welding, which uses a wider groove, narrow gap SAW employs a nearly parallel or V-shaped groove with a small root opening, allowing deep penetration with fewer passes. This method minimizes filler metal usage, reduces welding time, and produces high-quality welds for heavy-duty applications.

This technique is particularly valuable in industries where precision, structural integrity, and cost-effectiveness are critical. By limiting the groove width, heat input is controlled, significantly reducing thermal distortion and preserving the mechanical properties of the base material. Narrow gap SAW also ensures uniform weld deposition, excellent root penetration, and consistent metallurgical properties throughout the joint, making it suitable for thick steel plates and alloy materials.

Key Features

Oscillating tip, left-mid-right three position welding position, oscillating assembly is stable and reliable.
Chromium Zirconium Copper contact tip, alloy copper material torch soft connection with good conductive, those can increase life span.
Torch body is made of stainless steel and plasma paint technology.
Automatic flux feeding and recovery and sensors to sense sidewall variations.

SPECIFICATION

Max. Weld Thickness	400 mm
Groove Angle	1° – 2°
Groove Width	18 – 30 mm (18 – 22 mm at bottom)
Pass No. per Layer	Two passes (One pass at first layer)
Wire Diameter	3.0 / 4.0 mm
Wire Feed Speed	60 – 180 mm/min
Deposition Speed	5 – 10 kg/h
Torch Oscillating Range	≤ ±3.5°
Torch Oscillating Precision	≤ ±0.5°
Horizontal Tracking Precision	≤ ±0.2 mm
Vertical Tracking Precision	≤ ±0.5 mm
Cross Slide Strokes	300 × 400 mm
Highest Heated Temperature	350℃
Min. Diameter for Internal Welding	1500 mm