Heavy-Duty Mining Frames & Chassis Fabrication
Mining equipment operates in the most brutal environments on earth. The structural frames, base bases, and chassis that support excavators, crushers, and haul trucks must withstand constant high-frequency vibration, massive payload stress, and extreme impact forces without fracturing.
Openex is a trusted contract manufacturing partner for global mining OEMs. With lifting capacities up to 250 tons and massive on-site thermal stress relief furnaces, we have the unique capability to fabricate, weld, heat-treat, and machine the largest mining equipment frames in the world—entirely under one roof.
Mining Frame Manufacturing Specifications
We custom build heavy mining structures to exact OEM blueprints, ensuring strict adherence to AWS D1.1 structural welding codes.
| Maximum Dimensions | Lengths up to 30 Meters (98 feet) |
|---|---|
| Maximum Weight | Up to 250 Tons per frame |
| Materials Processed | High-Strength Low-Alloy (HSLA), ASTM A514 (T-1), Q345, S355, Weldox, and heavy Carbon Steel plates. |
| Welding Standards | AWS D1.1, ASME Section IX, ISO 3834-2. Multi-pass SAW and FCAW welding for deep penetration. |
| Quality & NDT Testing | 100% UT (Ultrasonic) and MT (Magnetic Particle) testing on critical high-stress joints. Large-scale CMM inspection. |
Our Work: Heavy Equipment Frames
The Manufacturing Process
Building a failure-proof mining frame requires strict metallurgical control. Here is how we execute massive frame projects:
We utilize heavy-duty oxy-fuel and plasma cutters to cut and bevel high-strength steel plates up to 300mm thick, preparing them for deep-penetration welding.
Our certified welders assemble the chassis using heavy jigs and fixtures. We employ strict pre-heating protocols and multi-pass SAW/FCAW welding to prevent hydrogen cracking in thick joints.
Massive welding introduces residual stresses. We place the entire assembled frame into our massive on-site heat treatment furnaces for Post-Weld Heat Treatment (PWHT) to ensure dimensional stability.
Finally, the stress-relieved frame is moved to our gantry mills and floor borers. We machine the mounting pads, engine mounts, and bearing housings to exact geometric tolerances.