Hi, Fully austenitic stainless steels like the 310 grade are very susceptible to microfissuring (hot cracking). For welding this series while reducing this possibility of micro-fissuring, it is recommended to: - Not preheat the base metal - Use low heat input. Use the lowest possible current necessary to make the fusion - Maintain a low interpass temperature, 200-300°F (100-150°C) max, at any time during welding - Make short, stringer and convex weld beads. Large, concave or flat beads are likely to centerline cracking; - Avoid highly forming highly constrained assembly during welding - Backfill weld craters; - Ensure to have a full penetration welds from the root pass. Thermals tresses due to temperature fluctuations cause often initiate micro cracks from root pass when there is a lack of penetration. Regards Badri
--- En date de : Jeu 24.1.13, prem nautiyal <prem_nautiyal26@yahoo.com> a écrit :
De: prem nautiyal <prem_nautiyal26@yahoo.com>
Objet: Re: [MW:16596] Linier indications observed in Radiography Testing in SA240 310S weld
À: materials-welding@googlegroups.com
Date: Jeudi 24 janvier 2013, 16h56
| Hi No need to preheat. Such microfissures are often encountered while welding 310 grade. Control your Interpass Temperature strictly while welding. Also weld with higher travel speeds to minimise your heat input. Regards Prem Nautiyal
--- On Wed, 1/23/13, mukesh.chaudhari <mukesh.chaudhari@orientalindia.net> wrote:
From: mukesh.chaudhari <mukesh.chaudhari@orientalindia.net>
Subject: [MW:16580] Linier indications observed in Radiography Testing in SA240 310S weld
To: materials-welding@googlegroups.com
Date: Wednesday, January 23, 2013, 4:41 PM
We are doing SA240 Type 310s material welding with WPS(GTAW) but there are lot of defects of linier indications(micro cracks) observed in Radiography testing. We are using D&H make ER-310 filler wire for welding. We also preheat the joint up to 80 °C to avoid sudden cooling. Can you guide me how to avoid linier indications(micro crack) in welding. --
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