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Home > Our Products > Boiler & Pressure Vessel Steel Plates> Support > Boiler Plate Welding & Edge Prep Guide
Boiler and pressure vessel fabrication involves critical weld joints that must withstand high pressure, heat, and corrosion. Improper edge prep or weld sequencing can lead to:
Boiler plates such as ASTM A516 Gr 60/70, A387 Gr 11/22, EN 10028 P265GH / P355NH, and DSQ plates are generally considered weldable under standard conditions.
However, their weldability depends on:
| Grade | Weldability | Preheat Required |
|---|---|---|
| A516 Gr 70 | Excellent | Yes, above 50mm |
| A387 Gr 11 / 22 | Moderate (Cr-Mo) | Yes (200–300°C) |
| EN P265GH / P355NH | Good | Preheat ≥ 25mm |
| DSQ (IS 8917) | Excellent | Not always required |
| Process | Usage | Remarks |
|---|---|---|
| SMAW (Stick) | Field welding, maintenance | Use low hydrogen rods (E7018) |
| GTAW (TIG) | Root passes, thin sections | Clean edges, inert shielding needed |
| GMAW (MIG/MAG) | Production welding, shops | Good for DSQ and A516 Gr 60/70 |
| SAW (Submerged Arc) | Thick plates, long seams | High productivity, stable arc |
Important: Always ensure low hydrogen electrodes, proper storage, and interpass cleaning to avoid hydrogen-induced cracking (HIC) in pressure service plates.
| Thickness (mm) | Edge Prep Type | Welding Method |
|---|---|---|
| 6–12 mm | Square edge | GMAW, SMAW |
| 12–25 mm | Single V / Bevel | SMAW, SAW |
| 25 mm & above | Double V / U edge | SAW, GTAW-SAW Combo |
Tip: For Cr-Mo (A387) plates, always remove mill scale before welding and maintain slow cooling.
| Grade | Preheat Temp | PWHT Required? | Remarks |
|---|---|---|---|
| A516 Gr 70 | 100–150°C | Optional > 50mm | Improves ductility |
| A387 Gr 11/22 | 200–350°C | Yes (620–700°C) | To avoid brittle welds |
| EN 10028 | 80–150°C | Depends on code | Follow EN 13445 / ASME Sect IX |
| DSQ Plates | 50–100°C | Not typically needed | Excellent cold formability |
Ensure adherence to following codes based on application:
We supply cut-to-size boiler plates with:
Our technical team assists fabricators in choosing the right weld process, consumables, and plate variant based on project need.
SAW with preheat and mandatory PWHT is ideal for thick Cr-Mo pressure plates.
Double V or U joint preparation is typically recommended for >25mm thickness.
Not always. It depends on the plate grade, thickness, and design code requirements.
Use low-hydrogen electrodes like E7018 or ER70S-6 based on base material.
Request Quote Boiler Plate Welding & Edge Prep Guide
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390/392, Ground Floor, Shankar Mansion, S.V.P. Road, Mumbai – 400004, India
High tensile plates are trusted across industries for their superior load-bearing, fatigue resistance, and weldability — especially in construction machinery, bridges, trailers, shipbuilding, and pressure vessels.
Explore top-performing grades like IS 2062 E350/E450, EN 10025 S355J2, ASTM A572 Gr 50, SAILMA, JFE Hiten, and S690QL — all available with MTCs and cut-to-size options.
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Read our expert guides on “E350 vs E450 vs S355”, “When to use high tensile steel”, and “Top 5 use cases in construction & fabrication” — updated for engineers, OEMs, and fabricators.
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