I. Causes of Cracks
Welding problem : welding too fast/too slow, and hydrogen cracks caused by the electrode not being dried
Material defect : Poor quality of steel or long-term corrosion
Stress concentration : unreasonable structural design or overpressure operation
Ii. Simple Processing Steps
Stop immediately : close the valve and evacuate people
Preliminary assessment :
Surface crack: Repair welding after grinding
Deep cracks: Professional welding repair
Penetrating crack: Parts need to be replaced
Professional inspection :
Magnetic particle detection of surface cracks
Ultrasonic detection of internal defects
Stress test : perform a 1.25 times stress test after repair
Iii. Preventive Measures
Regular inspection : annual comprehensive inspection, with a focus on weld seams
Standard operation :
Keep the pressure within a safe range
Avoid drastic changes in temperature
Materials management :
Use high-quality steel
The welding rods are strictly dried
Maintenance record : Establish a crack repair file
Iv. Precautions
Maintenance under pressure is strictly prohibited
Professional acceptance is required after repair
Report any cracks immediately upon discovery
Note: This guide is applicable to conventional crack treatment.
