Study of the Diffusible Hydrogen Content Affected from the Welding Electrode Humidity

The influences of moisture corruption and drying considerations on diffusible hydrogen were examined in this study. Two trials were carried out on an arc welding procedure, with the first being an assessment of the results of moisture contamination and the second being a test of the impact of welding constraints on diffusible hydrogen content. For example, the dispersible hydrogen found in welds was likened to the hydrogen levels of different unused electrodes. To calculate the proper drying constraints (Time and Temperature) for an applicable moisture contamination level in the weld electrode, an empirical equation was devised. For electrodes with a small diameter and welding parameter limits typically used for out-of-position welding, the equation is appropriate.

Experimental investigation on dissimilar weld between super duplex stainless steel 2507 and API X70 pipeline steel

This work investigates the microstructure and mechanical properties of 2507 super duplex stainless steel and API X70 high strength low alloy steel weld joint. This joint finds application in offshore hydrocarbon drilling riser and oil–gas pipelines. Coated shielded metal arc welding electrodes have been designed and extruded on 309L filler and their performance compared with a commercial austenitic electrode E309L. Filler 309L solidifies in ferrite-austenite (F-A) mode with a resultant microstructure comprising skeletal ferrites with austenite distributed in the interdendritic region. Results of tensile and impact tests indicate that weld fabricated with laboratory-developed electrodes has higher ductility and impact energy than the commercial electrode. The tensile strength and weld hardness of commercial electrodes are superior. The laboratory-made electrode’s microhardness is lower than the commercial electrodes, making the former less prone to failure. An alternative welding electrode coating composition has been suggested through this work and found to be performing satisfactorily and comparable to the commercially available electrodes.

Effect of Welding Using Electrodes With Certain Treatment on Stainless Steel 304 Using SMAW Welding

This paper will discuss about how the influence of welding electrodes which before being used in the welding process is given a certain treatment first. The treatment given to the welding electrode before the welding process is by dipping the welding electrode into the oil and dipping the welding electrode into the coolant. The effect of the welding electrode treatment on the SMAW welding results seen from the tensile strength. The specimen used is stainless steel type 304 with four welding variations. First, welding using Gutwelt type E308 welding electrodes. Second, welding using Nikko Steel type E308 welding electrodes. Third, welding using Nikko Steel type E308 welding electrodes that are oil dipped. Fourth, welding uses Nikko Steel type E308 welding electrodes which are dyed coolant. After tensile testing of the welding results, the results are obtained: welding using Gutwelt type E308 welding electrodes has greater tensile strength compared to using Nikko Steel type E308 welding electrodes. While welding using Nikko Steel type E308 welding electrodes that have been carried out certain treatments, namely by dipped coolant, produce greater tensile strength compared to using the Gutwelt type E308 welding electrodes. However, in welding using Nikko Steel type E308 welding electrodes that are oil dipped, the tensile strength is still lower than using a Gutwelt type E308 welding electrodes.

Study of corrosion resistance of doped surface layer with CuSn—CrxCy composition after plasma hardening

In the process of plasma surface hardening, coatings based on a mixture of CuSn alloy and 10/20 % OK 84.78 additive with high hardness were obtained. The study of the microstructures of the coatings showed that the content of the austenite phase decreases with an increase in the content of chromium carbide in the composition. The influence of the acidity parameter on the corrosion resistance of the alloyed surface layer with the composition of the mixture of alloys CuSn and the coating of the welding electrode OK 84.78 was evaluated. Corrosion control in 3% NaCl solutions with different pH values showed that the plasma coating has high corrosion resistance at pH = 7 and decreases by 2 times at pH = 3. An increase in the chromium content leads to an increase in the corrosion potential, and the presence of cracks leads to an increase in the corrosion current density.