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Wuxi Hengda Liquid-Purification Chemical Plant

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Anti Spatter Agent Minimize External Factors

Welding splashing, also known as welding spatter scavenger, for arc welding process can effectively reduce the welding surface attached to the surface of the splash, in order to reduce these splash on the post-process and appearance of the adverse effects, which can be large Increase the efficiency of production, reduce the labor intensity of workers. Therefore, welding Anti Spatter Agent at home and abroad, many large steel structure manufacturing enterprises as a welding process materials for welding production process. However, a qualified welding Anti Spatter Agent in addition to the anti-splash function, but also must ensure that the welding quality can not have adverse effects, such as the weld hole, not welding and other welding defects increased or significantly reduced mechanical properties.

At present, although in the domestic and foreign markets there have been a wide range of welding anti-splash brand and products, but not specifically for such products testing, testing standards. Therefore, the manufacturing enterprises and testing agencies on the welding anti-splash agent testing items, detection methods are different. In order to detect the anti-splash effect of two different types of welding Anti Spatter Agents and their influence on the welding quality of low-alloy high strength steel welds, the paper has designed the concrete according to the international standard (ISO15614-1) Of the test program, and achieved the desired detection results.

(1) In order to fully detect the anti-splash effect of two welding anti-splash agents (BD type and XQ type) and its effect on the quality of low alloy high strength steel melt gas welding seam, minimize the external factors on the test results The impact of the resulting. The test used a "blank control" of the conventional test method, that is, under the same welding conditions, a pair of non-spray splashing and any two were sprayed with two different models of anti-splash agent test panels, and then by comparing the two Anti - splash effect of anti - splashing agent and its influence on weld quality.

(2) In order to be able to fully detect the impact of two kinds of welding anti-splash agent on the forming quality and mechanical properties of the weld, the non-destructive testing and destructive testing of all the test pieces are carried out according to ISO15614-1 standard, Test the form of the test plate. The surface crack detection is carried out by detecting the surface of the test strip, and the detection of the defects in the weld zone of the test plate is carried out by ultrasonic inspection. The effect of the macromolecule on the overall fusion effect of the weld and the base metal is Phase test; for the overall mechanical properties of the weld test, through the most representative of the tensile and bending test items to complete.

(3) the material of the test board used in the welding structure of the more commonly used Q345B, test plate thickness of 12mm, unilateral groove angle of 30 °, the angle of 60 °, the root does not leave the blunt edge, between the test board reserved Clearance 2 ~ 3mm. In the fixed spot welding, the weld groove welding surface around 10mm within the oil, rust, etc. to remove the clean, until the exposed metal, the specific size of the test board and group requirements.

(4) welding method to choose a large splash of CO2 active gas shielded welding, welding method for PA multi-layer welding, weld form shown in Figure 2. Welding parameters selected by the welding process to verify the qualified parameters, the welding parameters of each layer as shown in Table 1. The three test panels in the course of the test were marked as KB, BD, XQ, where KB is the blank test plate that is not sprayed with Anti Spatter Agent. BD and XQ indicate that both sides of the test plate groove and the welding surface Respectively, evenly sprayed with a layer of welding anti-splash agent test panels.

(5) In order to minimize the impact of the welding operator on the test results, the welding process is arranged by the same welding operator under the same external conditions, and the welding operator is required to have the corresponding welding qualification (ISO9606-1 135 P BW 1.2 FM1 S t12 PA ml), and the welding operator involved in the test was not required to interrupt the welding operation for a long time before the test.

(6) test process: test material preparation → test plate welding → non-destructive testing → mechanical performance test → test results analysis.

3. Test results and discussion

(1) Comparison of the anti-splash effect of the two welding anti-splash agents After the welding work is completed, the attached surface of the three test panels is shown in Fig. It is not difficult to see that the surface of the KB test plate, which is not sprayed with the Anti Spatter Agent, is attached to the surface of the KB and XQ test panels, so that it is possible to determine the two Welding anti-splash agent can play a good anti-splash effect, anti-splash performance is no significant difference.

(2) Nondestructive test results for welds The surface of the weld surface and near surface defects of the magnetic particle detection reference standard ISO17638 carried out, magnetic particle testing parameters and test results shown in Table 2. Ultrasonic testing of weld defects is carried out with reference to ISO17640. The parameters and test results of ultrasonic flaw detection are shown in Table 3. All test results are judged by reference to the quality defect level of grade B welds in ISO 5817 standard.

Through the magnetic particle detection and ultrasonic testing, the results show that in all the weld surface, near the surface and internal welding defects can meet the ISO5817 standard B-class weld quality defect level requirements, and this also shows that two welding anti-splash The use of agents are not on the weld quality of the formation of a significant impact.

(3) weld macro metallographic test results KB, BD, XQ and other three test plate at the weld of the macro metallographic photos shown in Figure 4. It is not difficult to see from the figure that the weld defects of the three test panels are not found in the weld, cracks, not penetration, not fused, stomata, weld bad and other welding defects, which once again verified the magnetic particle testing and ultrasonic testing It is also concluded that the two types of welding Anti Spatter Agents have no significant effect on the forming quality of the weld.

(4) Mechanical properties test results For KB, BD, XQ and other three test plate weld transverse tensile test (each test plate 2 samples) and transverse bending (each test plate 4 samples) test The results are shown in Table 4. Comparing with the results of the transverse tensile test, it shows that the two welding Anti Spatter Agents have little effect on the overall strength and plasticity of the weld during the welding process, and have no significant effect on the overall tensile strength of the weld. The results show that there is no significant change in the plasticity and toughness of the four samples sprayed with the XQ-type welding anti-splash agent. However, there are no significant changes in the toughness compared with the blank sample. However, two tests of the BD-type welding Anti Spatter Agent Like, in the process of bending are produced in the obvious cracks. This indicates that the composition of the BD type anti-splash agent contains substances which make the weld metal structure and performance significantly different.

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