{"id":3226,"date":"2026-08-02T05:42:46","date_gmt":"2026-08-01T21:42:46","guid":{"rendered":"https:\/\/www.weldmc.com\/news\/welding-equipment-trial-run-pre-purchase-acceptance-testing\/3226\/"},"modified":"2026-08-02T05:42:46","modified_gmt":"2026-08-01T21:42:46","slug":"welding-equipment-trial-run-pre-purchase-acceptance-testing","status":"publish","type":"post","link":"https:\/\/www.weldmc.com\/ru\/%d0%bd%d0%be%d0%b2%d0%be%d1%81%d1%82%d0%b8\/welding-equipment-trial-run-pre-purchase-acceptance-testing\/3226\/","title":{"rendered":"Welding Equipment Trial Run: Pre-Purchase Acceptance Testing"},"content":{"rendered":"

When buying welding equipment, a trial run is not a formality. Pre-purchase testing that verifies positioning accuracy, load stability, and safety interlocks against acceptance criteria prevents costly post-installation rework. Many procurement teams skip detailed acceptance procedures, trusting supplier specs or a quick visual check, but manufacturing tolerances only become apparent under production-like conditions. This guide provides concrete trial run protocols and acceptance benchmarks for welding positioners, rotators, and manipulators, drawn from two decades of equipment integration. By the end, you will know what to test, how to interpret the numbers, and when to reject a machine.<\/p>\n

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What to Check Before You Buy<\/h2>\n

The core parameters that will determine whether a machine fits your production are often buried in a datasheet. Extract these explicitly before any trial run begins. Load capacity must match not only the part weight but also eccentric offset. For a 1-ton fixed-height welding positioner, for instance, the maximum eccentric distance is 150 mm and the center-of-gravity distance cannot exceed 200 mm. Exceeding either produces wobble that undermines weld quality. Speed range needs to cover your actual welding procedure, not a generic band. A typical rotator like the HGZ-30 offers 0.5\u20115\u202fRPM stepless control, adequate for submerged arc welding of pressure vessels but possibly too fast for some TIG overlay work.<\/p>\n

Positioning accuracy is the most frequent source of post\u2011purchase regret. Manufacturer data sheets often list \u00b10.5\u00b0 as standard, but that value must hold under full load, not on an empty table. Request the measurement conditions for those figures. Tilt and rotation ranges matter for complex joints. A 3\u2011axis positioner that tilts 0\u201190\u00b0 and rotates 360\u00b0 works well for five\u2011face welding of medium frames, while a fixed\u2011height L\u2011type model may be enough for pipe\u2011to\u2011flange work. Safety interlocks, emergency stop response time, and the integrity of conductive slip rings are equally critical, yet many buyers only test them after installation when it is too late to reject the machine.<\/p>\n

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How to Build a Trial Run Sequence<\/h2>\n

A trial run that consists of watching a workpiece rotate for five minutes tells you almost nothing. The sequence needs to stress the machine in the same way your production will.<\/p>\n

Begin by defining acceptance criteria from your own print tolerances. If a pressure vessel shop requires \u2264 1\u202fmm offset over a 4\u2011meter girth weld, the rotator must demonstrate creep prevention below 0.5\u202fmm over a continuous one\u2011hour run. Write these values into the purchase agreement before the FAT date.<\/p>\n

Defining Acceptance Criteria Before the Test<\/h3>\n

The acceptance sheet should list measurable outcomes, not qualitative impressions. For a welding positioner, state “maximum 0.5\u00b0 rotation error measured with a dial indicator at 90\u00b0 and 180\u00b0 intervals,” not “smooth rotation.” For a manipulator boom, “deflection under 0.1\u202fmm per meter of extension with 10\u202fkg applied at the tip” is a clear go\/no\u2011go point. When the buyer supplies the criteria, the supplier has no room to interpret vague phrases in their favor.<\/p>\n

Running a Load Stability Test<\/h3>\n

Load the machine to its full rated capacity with a test part that represents your worst\u2011case offset. Monitor current draw on the drive motor. An increase beyond 15% of the no\u2011load value while traversing the same path suggests binding or inadequate bearing preload. For rotators, check axial drift with a dial indicator fixed to a magnetic base. A drift exceeding the promised anti\u2011creep limit within 30 minutes points to roller alignment issues or an under\u2011rated reducer. Stop the test and document the variance. If the supplier cannot adjust it on the spot, the machine is not ready for your floor.<\/p>\n

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Accurate positioning is at the core of pre-purchase testing. <\u041a\u0430\u043a \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u0430\u0440\u043a\u0438 \u0442\u0440\u0443\u0431 \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u0432\u044b\u0441\u043e\u043a\u043e\u0442\u043e\u0447\u043d\u043e\u0433\u043e \u0441\u0432\u0430\u0440\u043e\u0447\u043d\u043e\u0433\u043e \u043f\u043e\u0437\u0438\u0446\u0438\u043e\u043d\u0435\u0440\u0430<\/a>> covers how \u00b10.5\u00b0 accuracy directly impacts joint fit\u2011up and consistency in automated lines.<\/p>\n<\/blockquote>\n

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Acceptance Benchmarks for Common Equipment<\/h2>\n

The table below translates R&D\u2011derived specifications into field\u2011measurable acceptance criteria that buyers can check during a trial run.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Equipment Type<\/th>\n\u041f\u0430\u0440\u0430\u043c\u0435\u0442\u0440<\/th>\nAcceptance Criterion (FAT)<\/th>\nWUXI ABK Reference Model<\/th>\n<\/tr>\n<\/thead>\n
\u0421\u0432\u0430\u0440\u043e\u0447\u043d\u044b\u0439 \u043f\u043e\u0437\u0438\u0446\u0438\u043e\u043d\u0435\u0440<\/td>\nRotation accuracy<\/td>\n\u00b10.5\u00b0 under full load, tested at 0\u00b0, 90\u00b0, 180\u00b0, 270\u00b0<\/td>\nHBJ\u201110 (1\u202fton)<\/td>\n<\/tr>\n
\u0421\u0432\u0430\u0440\u043e\u0447\u043d\u044b\u0439 \u043f\u043e\u0437\u0438\u0446\u0438\u043e\u043d\u0435\u0440<\/td>\nLoad eccentric stability<\/td>\nNo visible wobble at max eccentric: 200\u202fmm CG distance<\/td>\nHBJ\u201130 (3\u202ftons)<\/td>\n<\/tr>\n
\u0421\u0432\u0430\u0440\u043e\u0447\u043d\u044b\u0439 \u0432\u0440\u0430\u0449\u0430\u0442\u0435\u043b\u044c<\/td>\nCreep prevention<\/td>\n<0.5\u202fmm axial drift during a 1\u2011hour continuous girth weld<\/td>\nHGZ\u201130 (30\u202ftons)<\/td>\n<\/tr>\n
\u0421\u0432\u0430\u0440\u043e\u0447\u043d\u044b\u0439 \u0432\u0440\u0430\u0449\u0430\u0442\u0435\u043b\u044c<\/td>\nSpeed constancy<\/td>\n<2% variation from set speed across load range<\/td>\nHGZ\u201150 (50\u202ftons)<\/td>\n<\/tr>\n
\u041c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0442\u043e\u0440 \u0434\u043b\u044f \u0441\u0432\u0430\u0440\u043a\u0438<\/a><\/td>\nBoom deflection<\/td>\n<0.1\u202fmm\/m at full horizontal extension with 10\u202fkg payload<\/td>\nLH8080 (8\u202fm\u00d78\u202fm)<\/td>\n<\/tr>\n
All equipment<\/td>\nEmergency stop<\/td>\nFull stop within 0.5\u202fs, verified with high\u2011speed camera or timer<\/td>\nAll models<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

What to Do When a Test Fails<\/h3>\n

A single failing criterion does not automatically mean the machine is scrap. It means the supplier must either recalibrate the machine, replace a component, or provide written justification with documented tolerances that still meet your production intent. Accept nothing less than a re\u2011test after correction. Over the years, we have replaced a positioner\u2019s slewing bearing on the test floor because it showed 0.8\u00b0 backlash at 90\u00b0 tilt; the corrected unit held 0.3\u00b0 and was shipped the next week.<\/p>\n

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Factory Acceptance Testing Checklist<\/h2>\n

Attend the FAT in person. When that is not possible, request a video\u2011verified test log showing each measurement point. The checklist below covers the minimum.<\/p>\n