To implement a repair to a crack on a base material SA 516-Gr 70, you must follow a proper welding procedure which includes the following steps:
1. Pre-Weld Inspection: Inspect the cracked area to determine the extent of the damage and verify that it can be repaired through welding. If the crack is extensive and compromises the structural integrity of the material, you may need to perform a metallurgical replica to determine if it's feasible to repair or if the material needs to be replaced.
2. Crack Removal: Remove the cracked area by grinding or gouging the crack using an angle grinder or a carbon-arc gouging technique. Ensure complete crack removal and create a smooth, gradual transition along the edges of the groove.
3. Surface Preparation: Clean and prepare the area to be welded by removing rust, paint, oil, grease, or any foreign contaminants. Ensure that the groove sides and surrounding areas are free from defects or damage like gouges, sharp edges, or overcuts.
4. Preheat: Preheat the base material following the base material manufacturer's guidelines or the welding procedure specification (WPS). For SA 516-Gr 70, the preheat temperature is typically between 150°F to 300°F (65°C to 150°C) depending on the thickness of the material and the welding process being used. The preheat should be maintained throughout the entire welding process.
5. Welding Procedure Specification (WPS): Follow an approved Welding Procedure Specification (WPS), which defines the welding parameters, filler metal, and welding techniques to be used for the repair. For SA 516-Gr 70, a suitable filler metal can be a low hydrogen electrode, such as AWS E7018 or E7016.
6. Welding Technique: A suitable welding technique should be chosen based on the WPS, e.g., Shielded Metal Arc Welding (SMAW), Gas Metal Arc Welding (GMAW), etc. Properly position the workpiece and apply the welding technique following the appropriate sequence and deposition rates.
7. Interpass Cleaning and Inspection: Between each weld pass, clean the weld bead by wire brushing or grinding to remove any slag or impurities. Inspect for any defects or discontinuities.
8. Post-Weld Inspection: Upon completion of the welding, visually inspect the weld for any noticeable defects or irregularities. Further inspections might be necessary, such as dye penetrant testing to confirm the absence of éventuel appearance of other crack.
Best regards,
Le mar. 20 jui. 2023 à 13:09, Ashish Chacko <iamashleo007@gmail.com> a écrit :
Unfortunately i cant share the sketch. Base material is SA 516-GR 70 and clad material is SS 347.And the service is NG saturator.On Tuesday, 20 June 2023 at 11:56:31 UTC+3 Ahmed Eissa wrote:Dear Sir,Please provide sketch of Crack location and Materials grade and service of the HE.Thickness and if any of API 934 series applyThanksOn Tue, Jun 20, 2023 at 10:48 AM, Ashish Chacko<iamash...@gmail.com> wrote:Request for Expert Advice on Crack Repair
I am writing to request the support of the experts out here on a crack repair in an exchanger. The exchanger has a fillet weld with the shell, and a crack was found during the last TAM. There is a possibility that the crack will be found again during this TAM.
The base material of the exchanger is 58mm P1 (A516-GR 70) with cladding of SS347 of 6mm. There are two scenarios to consider:
- Scenario 1: Localize repair of the ring chamber fillet weld by grinding and welding. The client is requesting for annealing after the repair. Is this really required?
- Scenario 2: If the crack propagates to the shell, the client is asking for DHT and PWHT. When should DHT be performed, before or after the cladding weld? Is there any exemption for PWHT?
I would be grateful for any advice that you can provide on these two scenarios. Thank you for your time and consideration.
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