Container Plate Cutting: Q345R Normalized Steel Plate Cutting, Q345R Laser Cutting, Wugang Q345R Steel Plate

Container plate cutting: Q345R normalized steel plate cutting, Q345R laser cutting, Wugang Q345R steel plate

Q345R vessel plates are widely used in pressure vessel manufacturing, but the cutting quality and riveting quality are directly related to equipment safety. Many people only focus on the steel plate itself, but ignore the inspection standards of the cutting surface and the inspection standards of the welded joints. Once defects appear, they will be reworked in minor cases, and may cause safety accidents in serious cases.

Key points for quality inspection of cutting surfaces

As far as the operation of Wugang Sun Fan's team is concerned, laser cutting can achieve high-precision processing . How to detect the quality of Q345 steel plate riveting welding , however, the quality of the cutting surface must undergo strict inspection. First , how to detect the quality of Q345 steel plate riveting welding requires checking whether there are cracks, chips or slag on the cutting surface. Especially for Q345R steel plates with larger thickness, a hardened layer may be generated in the heat-affected zone during cutting. In actual operation, you can use a magnifying glass to check whether the cutting texture is uniform, and feel the surface roughness by touching it with your hands.

Secondly, the cutting size deviation must be measured. According to the GB/T 713.2-2023 standard, the regulations after cutting the container plate clearly specify the side length error and diagonal error. During on-site inspection, use vernier calipers and tape measures to actually measure each cut piece, record the data and compare it with the drawings. For bevel cutting, use an angle ruler to detect the bevel angle and blunt edge size to ensure complete penetration during subsequent welding.

Base material re-inspection and identification verification

Every time a Q345R steel plate enters the factory, the quality certificate must be checked. For steel plates delivered in a normalized state, their mechanical properties and chemical composition need to comply with the requirements stipulated in GB/T 713.2-2023. The inspector should check whether the grade, heat batch number and specifications are clearly marked on the steel plate. This relevant information must be completely consistent with the warranty, and there must be no traces of ambiguity or alteration.

If the normalizing and tempering process is used for Q345R steel plates with larger thickness, the tempering temperature has strict requirements. How to detect the quality of Q345 steel plate riveting welding for steel plates with thickness greater than 50mm? The tempering temperature should not be lower than 650℃. On-site inspection of production records or entrusting a third party to conduct metallographic analysis can confirm whether the heat treatment process is in place. Without proper heat treatment, the impact toughness and lamellar tear resistance of steel plates will be greatly reduced.

Welding materials and process verification

First of all, whether the quality of riveting welding can meet the standard depends on whether the selection of welding materials is properly matched. For Q345_R steel plates, welding rods or wires of corresponding grade must be selected, and the strength and toughness of the deposited metal must be at the same level as the base metal. During the inspection process, the grade, specifications and drying records of the welding materials need to be carefully checked. At the same time, it is also necessary to observe on-site the storage environment of the welding materials to see whether the dryness and temperature meet the relevant requirements.

The core basis is the welding process assessment report. The welding method, preheating temperature, inter-pass temperature, welding speed and other parameters used for each weld are required to be consistent with the qualified process. On-site inspection personnel can spot-check whether the welder is working with a certificate and whether the actual welding parameters are within the scope of the process regulations. Especially for thick plate welding, improper inter-pass temperature control is prone to cold cracks.

Weld appearance and size inspection

The quality of the welds directly reflects the level of operation. During the inspection, first conduct a visual inspection to see whether the welds are beautiful in shape and whether there are surface defects such as undercuts, pores, cracks, and lack of fusion. For Q345R container plates, the depth of undercuts is not allowed to exceed 0.5mm, and there are also restrictions on the continuous length. Inspectors need to use a weld inspection ruler to measure dimensions such as reinforcement, weld width, and offset.

For dimensional inspection, the scope must cover all butt welds and fillet welds container plate cutting: Q345R normalized steel plate cutting, Q345R laser cutting, Wugang Q345R steel plate. Use a weld gauge to measure whether the reinforcement is within the standard range. Within, it will not exceed 3mm under normal circumstances. For the case of butt joints of unequal thickness plates, the smoothness of the thinning transition zone needs to be measured. These details may seem trivial, but they will have a direct impact on the fatigue life of the pressure vessel under alternating loads.

Non-destructive testing and pressure testing

After the surface defect inspection is judged to be qualified, non-destructive testing needs to be carried out. For checking internal defects, radiographic testing or ultrasonic testing is the main method. According to GB/T 713.2-2023 and related pressure vessel specifications, different weld grades have their own corresponding inspection ratios and qualification levels. Before conducting the inspection, it is necessary to confirm the qualifications of the flaw detector, the calibration status of the equipment, and whether the inspection timing meets the requirements. For example, what you need to know is whether the exact standard information is after 24 hours after welding.

The last level is the pressure test. After the vessel is made, a hydraulic test or an air pressure test must be conducted to verify the strength of the weld and the base material. The test pressure, pressure holding time, and medium temperature must be strictly implemented in accordance with the drawings and standards. During on-site observation, focus on whether there is leakage or abnormal deformation in the weld and heat-affected zone. Only after the test is passed can the subsequent anti-corrosion and insulation processes be carried out.

Inspection records and traceability management

All inspection data must be recorded promptly and accurately. Among them, the record form should cover information such as test items, test results, test personnel, test date, etc. If there are non-conforming items, the handling method and the re-inspection results after repair need to be indicated. These records are not only quality certificates, but also the basis for product traceability.

For each piece of equipment, an independent quality profile should be constructed. After the steel plate enters the factory, it undergoes re-inspection, cutting and blanking operations, riveting and welding assembly, non-destructive testing and pressure testing. The test reports, warranty documents and process documents generated by all these links must be filed and properly preserved. Once a problem occurs when the equipment is put into use, the source can be quickly traced back to the raw materials and manufacturing process, so that the cause can be analyzed and the responsibility can be clarified.

When you are inspecting Q345R steel plate rivet weldments, what is the most troublesome quality issue? You are welcome to leave a message in the comment area to share your own experience. If you feel that this article is practical, don’t forget to like it and forward it to more peers.