Instructions for Use of Carbon Steel Electrodes
Carbon steel electrode is suitable for welding carbon steel and low-strength low-alloy steel. A
The selection of welding rod is based on the requirements of the chemical composition, mechanical properties, and crack resistance of the steel, and comprehensive analysis of factors such as welding structure, steel plate thickness, working conditions, stress conditions, and welding machine performance are also considered. If necessary, conduct welding tests, formulate corresponding process measures, and then determine the selection of welding rods.
⒈Welding of carbon steel generally selects the welding rod corresponding to the strength grade of the steel. At the same time, considering the complex structure, thick plate, high rigidity, dynamic load, and poor weldability, generally select good plasticity, high impact toughness, and good crack resistance. Hydrogen electrode. If there are special requirements for the welding position, use corresponding special electrodes, such as vertical downward welding electrodes, bottom welding electrodes, etc. In order to improve welding efficiency, iron powder electrode can be used. A
⒉For welding seams with fast cooling speed, increased strength, and welding seams prone to cracks, welding rods with a strength one level lower than the base metal can be selected at this time; dissimilar steel welding between low carbon steel and low alloy steel is generally selected and the strength Corresponding welding rods for low-grade steel, and considering low-alloy steel factors, it is appropriate to select low-hydrogen type.
⒊For the welding of medium carbon steel, due to the high carbon content of the steel, the tendency of welding cracks is increased. Generally, low-hydrogen electrode is selected and methods such as preheating, slow cooling and suitable welding processes are adopted.
⒋The weldability of cast steel is poor, generally the carbon content is high, the workpiece is thick, the structure is complex, and it is easy to produce welding cracks. When the cast steel has more alloy elements, it is more prominent. Generally, low-hydrogen electrode is selected, and measures such as preheating, slow cooling, and corresponding welding techniques are adopted.
⒌In order to ensure the quality of welding, the welding joints of the workpiece should be cleaned, and oil, rust, moisture, paint and dirt are not allowed. It is especially important to use low-hydrogen electrode.
⒍For low-hydrogen electrode, the electrode must be baked at 350℃ for 1h before welding, and used as it is baked, otherwise defects such as pores, slag inclusion, cracks and so on are likely to occur. Cellulose electrodes generally do not need to be baked. If they are damp, they should be baked before welding at the temperature specified in the instructions. However, if the temperature is too high, the welding process performance of the electrode will be damaged.
⒎The welding current specified in the manual is a reference value, and it should be specifically mastered in actual operation. For example, the preheating of the workpiece can be 5% to 15% lower than the normal current; vertical welding and overhead welding are 10% to 15% lower than that of flat welding; When using DC, it can be reduced by about 10% compared with AC. When using a DC welding machine, pay attention to the level of welding specified in the manual, otherwise the welding process will be affected.
⒏Generally, low-hydrogen electrode should not be baked repeatedly to prevent the coating from being crisp and falling off.
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