Choosing a trailing shield starts with the welding procedure and the surface that must remain protected while cooling. A properly selected shield extends inert-gas coverage over the weld face and adjacent heat-affected zone; it does not replace root-side purging where the reverse side of the joint also requires shielding.
Start with material and weld-quality requirements
Titanium, zirconium, stainless steels and duplex stainless applications may require extended shielding to control oxidation and discoloration. Confirm the material-specific requirements and acceptance criteria in the applicable welding procedure before selecting equipment.
Match the shield profile to the workpiece
| Application | Selection information |
|---|---|
| Flat sheet or plate | Confirm seam location, coverage width and available torch clearance. |
| External pipe or vessel radius | Provide the actual outside diameter and required coverage area. |
| Internal radius | Provide the actual inside diameter and available torch clearance. |
Use actual measured dimensions rather than nominal pipe size, particularly when selecting a radiused shield.
Confirm torch and welding-process compatibility
Confirm the torch model, shielding-gas nozzle dimensions, process and whether welding is manual or automated before ordering. The mounting arrangement must suit the torch head and the available space around the joint.
Consider heat input, travel speed and coverage
Shield size and coverage length should suit joint geometry, heat input and travel speed. Automated welding or larger workpieces may need a wider or longer configuration. Gas flow should be set and verified as part of the welding procedure; higher flow alone does not assure protection.
Choose the right shielding method
Trailing shield or gas drag: protects the weld face and adjacent heat-affected zone as the torch moves.
Root purging: protects the reverse side of a joint when required.
Purge chamber or enclosure: may suit parts that need a broader inert environment.
Custom-order configurations
Where a standard shield is not the right fit, custom-order external secondary-shielding configurations may be available. These can include different metal-body profiles, replaceable sealing gaskets, controlled gas-diffuser arrangements, and torch-holder or support-block geometry tailored to the application. Provide the material, measured dimensions, process, torch details and duty-cycle requirements for review.
Request application support
For help selecting an Argweld weld trailing shield, send Justram the material, joint geometry, measured pipe or vessel diameter, welding process, torch details, and manual or automated setup.