Oxyacetylene Wire Erosion Rate Testing Service

Oxyacetylene Wire Erosion Rate Testing Service – Comprehensive Evaluation of Material Resistance to High‑Temperature Gas Erosion for Mining, Energy and Industrial Applications in Chile

As an ISO/IEC 17025 accredited independent testing laboratory, we offer specialised oxyacetylene wire erosion rate testing services to manufacturers, engineering contractors, asset owners, and quality assurance teams across the mining, energy, metallurgical, petrochemical, and heavy industrial sectors. Oxyacetylene wire erosion – a high‑temperature, high‑velocity gas erosion phenomenon – simulates the aggressive thermal and mechanical attack that materials experience in environments such as gas turbines, rocket nozzles, furnace burners, cutting torches, and welding applications. The erosion rate, measured as the mass loss or dimensional change of a wire or rod specimen per unit time under a controlled oxyacetylene flame, is a critical performance indicator for materials used in high‑heat flux and particle‑impact conditions. In Chile's demanding industrial landscape – from the copper smelters and refractory linings of the northern mining region to the gas‑fired power generation plants along the coast and the welding and cutting operations in construction and shipbuilding – the ability of materials to withstand oxyacetylene erosion directly affects equipment life, safety, and operational costs. Our test protocols evaluate the erosion rate, oxidation resistance, thermal stability, and structural integrity of metallic wires, rods, and consumables under controlled flame conditions. All methods are aligned with ISO, ASTM, and NCh standards, including ASTM G76 (Standard Test Method for Conducting Erosion Tests by Solid Particle Impingement Using Gas Jets – adapted for flame erosion), ASTM E92 (Hardness testing), ISO 1461 (Hot dip galvanized coatings – for wire), NCh 2073 (Industrial equipment – Erosion testing), and NCh 325 (Mining – Safety measures). Our inspection and test reports are recognised by the Superintendency of Electricity and Fuels (SEC), the National Geology and Mining Service (SERNAGEOMIN), the Ministry of Public Works (MOP), and leading Chilean mining, energy, and industrial companies for material qualification, quality assurance, and safety compliance.

Materials and Products We Regularly Test

Our oxyacetylene wire erosion test facilities accommodate a wide range of metallic wires, rods, and consumables used in high‑temperature and high‑wear applications. Typical test articles include:

• Solid wires for welding and surfacing – mild steel, stainless steel, nickel‑based alloys, copper‑based alloys, and aluminium alloys
• Flux‑cored wires – for hardfacing and wear‑resistant overlay applications
• Thermal spray wires – for coating applications in boilers, furnaces, and turbine components
• Cutting and gouging rods – for oxyacetylene cutting and gouging operations
• Electrode wires for EDM (electrical discharge machining) – for precision machining applications
• Refractory metal wires – tungsten, molybdenum, tantalum, and their alloys
• Consumable electrode wires for arc welding – for evaluating the erosion resistance of the weld deposit
• Prototype and custom alloy wires – for R&D and new product development

Test Methodology – Controlled Oxyacetylene Flame Erosion

• Test setup – oxyacetylene torch and specimen holder – We use a precision‑controlled oxyacetylene torch with calibrated gas flow meters (acetylene and oxygen) to produce a stable, high‑temperature flame (temperature typically 3 000‑3 200 °C). The wire or rod specimen (typically 6‑12 mm diameter, 100‑200 mm length) is mounted in a rotating or translating holder at a fixed distance from the torch tip. The specimen is exposed to the flame for a specified duration (e.g., 30 seconds, 60 seconds, 120 seconds) at a controlled angle (typically 90° for impingement). The test is performed in a controlled environment (lab air, or inert gas for oxidation‑sensitive materials).
• Erosion rate measurement – mass loss and dimensional change – We measure the mass of the specimen before and after the test using a precision balance (±0.0001 g). The erosion rate is calculated as the mass loss per unit time (g/s or g/min) or as the mass loss per unit area (g/cm²). We also measure the diameter reduction (for wires) or the length reduction using a digital calliper (accuracy ±0.01 mm). The erosion rate is reported for each test condition.
• Flame condition standardisation – gas flow rates, flame temperature, and heat flux – We control the gas flow rates (acetylene and oxygen) to achieve a neutral or slightly carburising flame. The flame temperature is measured using a two‑colour pyrometer or a thermocouple (for lower temperatures) to ensure consistency. The heat flux (kW/m²) is calculated from the gas flow rates and the calorific value of the gases. The test conditions are standardised to ensure repeatability.
• Specimen preparation and conditioning – for consistent results – We machine the wire specimens to the specified dimensions, clean them with acetone, and dry them at 100 °C for 1 hour. The surface roughness is measured (Ra) to ensure that the initial condition is consistent across specimens. The specimens are conditioned at 23 °C and 50 % RH for 24 hours before testing.
• Number of specimens and test repeats – for statistical confidence – We test a minimum of five specimens per material or condition. The mean erosion rate, the standard deviation, and the coefficient of variation (CV) are reported. A CV < 10 % is considered excellent.

Evaluation of Erosion Mechanisms – Oxidation, Melting, and Mechanical Spallation

• Mass loss analysis – gravimetric method – We weigh the specimen before and after the test to determine the total mass loss. The erosion rate is expressed in g/s or g/min. A low erosion rate indicates high resistance to oxyacetylene erosion.
• Dimensional change – diameter reduction and length change – We measure the diameter at multiple points along the specimen (before and after) to determine the material loss profile. The diameter reduction is expressed in mm or as a percentage of the original diameter. The length change (shortening) is also recorded.
• Oxidation scale and slag formation – visual and microscopic examination – We examine the eroded surface using a stereomicroscope and a scanning electron microscope (SEM) to assess the morphology of the oxidation scale, the presence of cracks, and the extent of melting and spallation. The scale thickness is measured on metallographic cross‑sections.
• Microstructural changes – grain growth, phase transformation, and precipitate coarsening – We prepare metallographic sections of the eroded specimens (before and after) to examine the heat‑affected zone (HAZ). The grain size, the hardness profile, and the presence of secondary phases are evaluated using optical microscopy and SEM/EDS.
• Hardness change – to assess the thermal and mechanical effect of the flame – We measure the Vickers or Rockwell hardness of the specimen before and after the test, at different distances from the eroded surface. The hardness profile is plotted to show the thermal effect on the material.

Erosion Rate at Different Temperatures and Flame Conditions – Simulating Service Environments

• Neutral flame condition – for baseline erosion rate – We test the specimen under a neutral oxyacetylene flame (oxygen/acetylene ratio ≈ 1.1) to determine the baseline erosion rate.
• Oxidising flame condition – for simulating high‑oxygen environments – We test under an oxidising flame (oxygen/acetylene ratio > 1.2) to evaluate the resistance to oxidation‑assisted erosion.
• Carburising flame condition – for simulating reducing environments – We test under a carburising flame (oxygen/acetylene ratio < 0.9) to evaluate the resistance to carbon pick‑up and embrittlement.
• High‑heat‑flux condition – for simulating extreme thermal gradients – We increase the gas flow rates to achieve a higher flame temperature and heat flux (e.g., 3 200 °C, 5 MW/m²). The erosion rate at elevated heat flux is compared to the baseline.
• Low‑heat‑flux condition – for simulating lower‑intensity heating – We reduce the gas flow rates to achieve a lower flame temperature (e.g., 2 500 °C) to simulate pre‑heating or annealing conditions.

Simulation of Extreme Climatic and Operating Conditions – Atacama Desert, Patagonia and High Altitude

• High‑temperature conditioning of test specimens – for simulating the Atacama Desert – We condition the specimens at 60 °C for 24 hours before the erosion test to simulate the high ambient temperatures of the northern Chilean desert.
• Low‑temperature conditioning – for simulating the Patagonia and the Andes – We condition the specimens at -20 °C and -30 °C for 24 hours before testing to simulate the cold environments of the south and the high‑altitude regions.
• High‑altitude simulation – for mining operations at 3 000‑5 000 metres – We perform the erosion test in a low‑pressure chamber (simulating altitudes of 3 000‑5 000 m) to evaluate the effect of reduced oxygen partial pressure on the erosion rate.
• Humidity conditioning – for coastal and southern Chilean climates – We condition the specimens at 95 % RH and 40 °C for 48 hours before testing to simulate the humid conditions of the coastal and southern regions.

Data Analysis and Interpretation – Quantifying Erosion Resistance

• Erosion rate (g/s or g/min) – The primary output of the test. A lower erosion rate indicates better resistance to oxyacetylene erosion. Typical erosion rates for common materials: mild steel: 0.1‑0.5 g/min; stainless steel: 0.05‑0.2 g/min; nickel‑based alloys: 0.02‑0.08 g/min; refractory metals: < 0.01 g/min.
• Specific erosion rate (g/cm²·s) – The erosion rate normalised by the exposed surface area. This allows comparison of materials with different sizes.
• Oxidation scale thickness (µm) – The thickness of the oxide layer formed on the surface. A thicker scale indicates higher oxidation, which may accelerate erosion through spallation.
• Hardness retention (%) – The ratio of the hardness after erosion to the hardness before erosion. A retention > 80 % is excellent ; between 70 and 80 % is acceptable ; < 70 % is insufficient.
• Microstructural change (grain size, phase) – for assessing thermal stability – The grain size and the presence of any new phases (e.g., carbides, intermetallics) are evaluated and compared to the original microstructure.
• Statistics and uncertainties – For each series of tests (at least 5 specimens), we provide the mean, standard deviation, and coefficient of variation (CV) for the erosion rate and the hardness retention. A CV < 10 % is considered excellent.

Regulatory Compliance and Certification – Supporting SEC, SERNAGEOMIN and MOP Requirements

Chile has a robust regulatory framework for industrial equipment and materials used in high‑temperature applications, involving several institutions and technical standards:

• SEC – Superintendency of Electricity and Fuels – Regulates the safety of welding, cutting, and thermal processing equipment, including the consumables used in these operations.
• SERNAGEOMIN – National Geology and Mining Service – Establishes safety requirements for materials used in mining operations, including those exposed to high‑temperature and high‑wear conditions.
• MOP – Ministry of Public Works – Sets standards for construction materials and welding consumables used in public infrastructure.
• ISO 4063 – Welding and allied processes – Nomenclature of processes and reference numbers – The international standard for welding process classification.
• ASTM G76 – Standard Test Method for Conducting Erosion Tests by Solid Particle Impingement Using Gas Jets – Used as a reference for erosion testing (adapted for flame erosion).
• ASTM E92 – Standard Test Methods for Vickers Hardness and Knoop Hardness of Metallic Materials – for hardness measurement.
• NCh 2073 – Industrial equipment – Erosion testing – The Chilean standard for erosion testing.
• NCh 325 – Mining – Safety measures – The Chilean standard for safety in mining operations.
• Application areas in Chile – Copper smelters, gas‑fired power generation, welding and cutting in construction, shipbuilding and repair, and hardfacing of mining equipment.

Advantages of Our Service for the Chilean Market

• ISO/IEC 17025 accreditation – guaranteeing the reliability, traceability, and international acceptance of our results.
• Bilingual reports (Spanish/English) – to facilitate submissions to Chilean authorities and international partners.
• Simulation of extreme climatic conditions – our tests integrate the effects of high temperatures (Atacama Desert), low temperatures (Patagonia and the Andes), high altitude (Andean mines), and high humidity (coastal and southern regions).
• Support for SEC, SERNAGEOMIN and MOP certification – our reports are directly usable for equipment registration, material qualification, and safety compliance.
• Experience in the mining, energy and industrial sectors – our laboratory has extensive experience in the key sectors of the Chilean economy.
• Adapted turnaround times – we understand the logistical and commercial constraints of the Chilean market and are committed to delivering results within competitive timeframes.

Conclusion

Oxyacetylene wire erosion rate testing is a fundamental tool for guaranteeing the reliability, safety, and durability of materials used in high‑temperature, high‑wear, and high‑impact applications in Chile's demanding industrial environments. Our testing services, accredited under ISO/IEC 17025 and compliant with the requirements of the SEC, SERNAGEOMIN, MOP, and international standards, allow you to validate the erosion resistance of your materials, optimise your selection, and ensure regulatory compliance. Whether you are a wire manufacturer, mining company, energy producer, contractor, or quality engineer, we accompany you in the mastery of oxyacetylene wire erosion performance, from initial testing to final certification.