Canada – Semi Mobile Crusher and Screening
Purpose: Control of the welded manufacturing of the mechanical parts of the 2300-ton semi-mobile crusher to be used in the iron mine in Canada was carried out. Despite the difficult conditions brought by the region due to the production to be made in Canada, we are happy to have successfully completed our project.
The manufacturing process, carried out in 2 separate factories, was controlled from beginning to end by QCTurk inspectors. If we talk briefly about the manufacturing parts, the mobile crusher is made in two units and named as CR and SCR. In both groups, there are carrier legs (pontoons), platforms, conveyor belts and chutes and several connection parts like bracings.
Since the production will be used in Canada, all materials have been designed with materials that will meet the desired conditions at -20 ᵒC, taking into account the weather conditions there, and orders have been requested as J2 or NL accordingly. As QCTurk, all incoming materials were followed up in this process, their certificates were meticulously examined, and the necessary information flow was provided by warning the companies in advance against a possible delay.
The biggest problem that could occur in materials was that almost all profiles were made of build-up sections and the wall thickness of these profiles was around 40mm-50mm. All of these structural steels used in the platform were required to be welded with full penetration according to the technical drawings and full penetration welding of the head plates in the same way. All welds were also requested to be evaluated by ultrasonic testing. In this section, after all welds have been checked and approved by QCTurk, the measures that can be taken against weld shrinkage have been determined. The ultrasonic tests were witnessed by 3rd party surveillance and the companies were warned about pre-assembly as much as possible.
Since the back-gouging process required to ensure full penetration during welding cannot be performed on every piece due to the geometry of the piece, a test piece (mock-up part) was fabricated first and the welding gaps were left 2-3mm, the desired penetration was achieved without back-sgouging with MAG welding, and the welding process of such pieces continued under these conditions.
After all the manufactured parts were checked for dimensions one by one, deformations that may occur during welding were checked with a template within the tolerances given in the drawing, and welding visual controls were made, the approval for coating was given.
Since the surface quality was requested as Sa2½ according to the given specification, all areas were checked in detail after sandblasting and approval was given for the paint. The desired paint application as primer-intermediate and topcoat was checked at each stage by measuring the paint thickness and visually.
The parts, all of which are controlled in detail, have been checked by QCTurk during packaging and transportation, and finally, they have been supervised during the loading on the truck and approved by us for shipment.
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