The loader bucket is a core working component that directly contacts materials (such as ores, sand, soil, etc.). Its wear level directly affects operating efficiency and equipment service life. Wear on the bucket is not evenly distributed; wear-prone parts are mainly concentrated in areas where material impact, extrusion, and sliding friction are most intense. For wear-resistant treatments of these parts, appropriate technical solutions should be selected based on wear mechanisms (impact wear, abrasive wear, adhesive wear).

I. Wear-Prone Parts of Loader Buckets and Causes of Wear

The focus of wear varies slightly across different operating scenarios (such as heavy-duty mining, infrastructure loading and hauling, agricultural bulk material handling), but the core wear-prone parts share commonalities, as detailed in the table below:

II. Wear-Resistant Treatment Technical Solutions for Buckets

Based on the characteristics of different wear-prone parts, treatments featuring "impact resistance + abrasive resistance" or "high hardness + fatigue resistance" should be selected. Common technologies are divided into three categories: surface strengthening, structural optimization, and material upgrading. Specific solutions are as follows:

(I) Surface Strengthening Treatment: Enhance Local Surface Hardness (Suitable for Parts Dominated by Abrasive Wear)

Surface strengthening is the most commonly used wear-resistant treatment method. It extends wear life by covering wear-prone parts with high-hardness materials or modifying surface structures. Core technologies include:

1. Surfacing Welding with Wear-Resistant Welding Materials

• Applicable Parts: Bucket lip, bucket bottom, bucket side cutting edges, transition area (weld reinforcement).

• Technical Features: Through arc welding, submerged arc welding, or open arc welding, one or more layers of wear-resistant alloys (such as high-chromium cast iron type, tungsten carbide type welding materials) are surfacing-welded on the wear surface. The surface hardness can reach HRC 55-65 (the hardness of ordinary bucket steel plates is only HRC 15-20), and the abrasive wear resistance is improved by 3-5 times.

• Precautions: Preheating is required before surfacing (to avoid base material cracking), and slow cooling is needed after surfacing. "Reinforcing edges" should be surfacing-welded on edge parts such as the bucket lip and side cutting edges, with a recommended width of 15-30mm.

2. Selection of Wear-Resistant Electrodes/Welding Wires

• Light-Load Conditions (e.g., agricultural bulk materials): Choose D256 (high-manganese steel electrode, mainly for impact resistance);

• Medium-Load Conditions (e.g., sand loading and hauling): Choose D707 (high-chromium cast iron electrode, mainly for abrasive resistance);

• Heavy-Load Conditions (e.g., mining hard rock): Choose tungsten carbide welding wires (such as YD601, containing WC hard phases, for strong abrasive + impact resistance).

3. Thermal Spraying/Cold Spraying of Wear-Resistant Coatings

• Applicable Parts: Bucket bottom, bucket rear wall (large-area wear areas).

• Technical Features: Thermal spraying (e.g., flame spraying, plasma spraying) heats and melts wear-resistant powders (such as Al₂O₃, WC-Co) and sprays them onto the surface to form a coating with a thickness of 0.1-1mm, with hardness up to HV 1000-1500; cold spraying (room-temperature spraying) can avoid thermal deformation of the base material, making it suitable for thin-plate buckets, and the coating has stronger adhesion.

• Advantages: Uniform coating, no weld stress, suitable for complex curved surfaces (e.g., bucket bottom transition area).

4. Carburizing/Nitriding Treatment

• Applicable Parts: Bucket tooth seats, loader bucket hinge shafts (parts with fretting wear).

• Technical Features: Through chemical heat treatment, carbon/nitrogen atoms are infiltrated into the metal surface to form a high-hardness surface layer (carburized layer hardness: HRC 58-62; nitrided layer hardness: HV 800-1000), improving surface wear resistance and fatigue strength. It is especially suitable for mating parts under alternating loads (e.g., connection between bucket teeth and seats).

(II) Structural Optimization: Reduce Material Impact and Friction (Reduce Wear from the Design End)

1. Bucket Tooth Optimization

• Material Upgrading: Replace ordinary high-manganese steel bucket teeth (ZGMn13) with wear-resistant alloy bucket teeth (e.g., low-carbon high-chromium alloy, bainitic steel), improving wear resistance by 2-3 times; for heavy-load conditions, "tungsten carbide composite bucket teeth" (tooth tips inlaid with WC hard alloy blocks) can be used.

• Structural Design: Adopt a "sharp tooth + wide tooth root" structure (to reduce tooth tip chipping); adjust the tooth pitch according to material particle size (e.g., reduce tooth pitch in ore conditions to avoid jamming of large materials); use "tapered fit + pin locking" between bucket teeth and seats to reduce fit clearance (lower fretting wear).

2. Bucket Lip and Side Cutting Edge Reinforcement

• Weld wear-resistant guard plates (material: NM450/NM500 wear-resistant steel plates, hardness HB 450-500) under the bucket lip, with a thickness of 8-12mm, covering the entire length of the bucket lip;

• Weld "L-shaped wear-resistant angle steel" (same material as the guard plates) on the front edges of the side plates, with a height of 100-150mm, to prevent direct scratching of side cutting edges against rock walls.

3. Laying of "Wear-Resistant Strips" on the Bucket Bottom

• Weld parallel wear-resistant strips (material: NM500 or surfacing-welded wear-resistant strips) in the wear-prone area of the bucket bottom (1/3-2/3 of the length from the bucket lip, where material sliding is most intense), with a spacing of 200-300mm and a height of 5-10mm;

• Function: Reduce the direct contact area between materials and the bucket bottom, converting "surface friction" into "line friction", and improving wear life by 40%-60%.

4. Bucket Shape Optimization

• For sticky materials (e.g., wet clay), increase the radius of the rounded corner in the bucket bottom transition area (R≥150mm) to reduce material retention;

• For heavy-load conditions, adopt a "deep bucket shape + reinforcing ribs", increase the bucket bottom thickness from the ordinary 8-10mm to 12-16mm, and use "double-pass welding" to reinforce the connecting weld between the rear wall and the base plate.

(III) Daily Maintenance: Extend the Effect of Wear-Resistant Treatments (Reduce Abnormal Wear)

1. Regular Inspection and Repair

• Check whether bucket teeth are loose or worn before each operation (replace when wear exceeds 1/3 of the tooth height) and whether bucket tooth pins are missing;

• Inspect the wear of the bucket lip and side cutting edges weekly, and promptly repair slightly worn parts (e.g., small gaps) by welding to prevent wear from expanding.

2. Standardized Operation

• Avoid "slamming the bucket onto the ground" (to reduce impact wear), and keep the bucket at an inclination angle of 30°-45° when inserting into materials (to reduce stress on bucket teeth);

• Avoid "overload loading and hauling" (to prevent bucket bottom deformation and weld cracking), and try to empty materials completely during unloading (to reduce adhesive wear).

3. Rust Protection

• When idle for a long time, clean residual materials inside the bucket and apply anti-rust oil to wear-prone parts (to avoid corrosive wear in humid environments);

• Rinse the bucket promptly after operation (especially for corrosive materials such as salt ore and chemical fertilizers) to prevent chemical corrosion from aggravating wear.

III. Summary of Wear-Resistant Treatment Solutions for Different Wear-Prone Parts

Through targeted "surface strengthening + structural optimization + daily maintenance", the wear rate of loader buckets can be significantly reduced, and their service life can be extended (the service life of ordinary buckets is about 1,000-2,000 hours, and can reach 3,000-8,000 hours after wear-resistant treatment). At the same time, it reduces downtime for maintenance and lowers comprehensive operating costs.