Why Excavator Bucket Welds Keep Cracking

Start with the failure mechanism

A crack near a weld does not, by itself, establish fatigue as the cause. For SSAB steels, the manufacturer's guidance identifies delayed hydrogen cracking as a welding concern involving hydrogen, a susceptible microstructure and tensile stress. The timing of detection and the welding record can therefore matter as much as the crack location. [2]

For a recurring field issue, ask the responsible technical team to review the exact location, loading context, wear condition and previous work. Keep photographs before any surface preparation, with the asset ID, hours and a clear location reference.

A welded repair needs a procedure

TWI recommends removing cracked material fully and developing a repair procedure before welding. It also notes that a repair's fatigue performance can suffer when site conditions produce lower quality than the original fabrication. If longer life is needed, the investigation may need to address cyclic stress or fatigue strength around the repaired detail. [1]

Record the approved procedure, material identification, inspection findings, repair provider and acceptance decision. These records help the next team understand what was done without relying on a verbal handover.

Where HFMI may fit

High-frequency mechanical impact treatment is a post-weld improvement method. In a 2021 study on welded transverse attachment specimens, researchers found fatigue-life benefits after HFMI under the tested conditions, including specimens with shallow existing cracks. [3] Those results do not establish a universal crack-depth limit or a guaranteed life extension for an excavator bucket. Material, detail geometry, loading, inspection and treatment qualification still require application-specific assessment.

Document the treated area and inspection evidence separately from the weld repair. A treatment entry should identify who performed it, when it was completed and the procedure used.

Keep the evidence with the bucket

• Asset ID and a consistent map of the affected area.
• Host machine, recorded hours, site and operating context.
• Dated photographs and inspection reports before and after work.
• Repair procedure, provider, replaced components and any post-weld treatment.
• Return-to-service decision and follow-up inspection requirements.

A useful comparison follows the same detail over time: first reported condition, repair, return to service and any recurrence. Missing hours or unknown materials should remain marked as unknown rather than inferred.

Turn a repeat issue into a useful record

RYONX connects issue reports, documents and maintenance events to an attachment's digital passport. This gives manufacturers, owners and service partners a common record to review. It supports the investigation; inspection and repair decisions remain with the responsible technical team.

Explore maintenance history that stays with the asset, or learn about Maintenance & Repair Partners.