Low Alloy Steel Welding Electrodes
LOW ALLOY STEEL Welding Electrode:
Low alloy steel electrode is a kind of electrode that requires good plasticity, high impact toughness, good low temperature performance and strong crack resistance.
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Low alloy steel electrodes are divided into the following three categories:
1. Structural steel electrodes above 50 kg (except deposited metal Mn-Si series)
2. Molybdenum and lattice molybdenum pearlitic heat-resistant steel electrode
3. Low temperature steel welding rod
Solenoid Directional Valve for Radio Remote Control Grab
The solenoid valve is used for radio remote control grabs. It is an essential component that controls the hydraulic system, allowing the grab to open and close smoothly. The hydraulic block is installed in the middle of the under-roof beam, while the main control valves are integrated into the valve assembly. Proper functioning of these control valves ensures the grab operates correctly.
Here are some key troubleshooting steps:
1. When the grab opens with a great impact, adjust the throttle valve (YPYK025019) by turning it clockwise to reduce the flow and slow down the opening speed. The throttle should not be opened too much—ideally around 50% to maintain optimal performance. Additionally, check if the electromagnetic valve B is powered on, as it should normally be in a powered state.
2. If the grab does not open when power is connected, first verify that both electromagnetic valves A and B are properly powered. Then, check the position of the valve handle to ensure it is in the maximum position. If these checks fail, use the emergency hand-pull mechanism to open the grab, following the procedure outlined in section 5.6.
3. If the grab cannot close, first check whether the electromagnetic valve A is in a non-powered state. Next, confirm the oil level meets the requirements—typically, the hydraulic oil should be above the midpoint of the oil level gauge. Also, inspect the one-way valve inside the hydraulic cylinder.
To test the one-way valve, remove one of the high-pressure hoses connected between the valve block and the upper part of the oil trunk. Block the hose to prevent leakage, then pull the slip board and press the "open" button on the remote controller. If the grab opens slowly, there may be an issue with the hydraulic cylinder. If it opens normally, the cylinder is likely fine. Repeat the process for the other cylinder. If both cylinders work correctly, the problem may lie with the hydraulic valve block, which should be inspected further.
Another method involves lifting the slip board and positioning the ears close to the cylinder walls. If a hissing sound ("sisi") is heard, it may indicate a faulty one-way valve. If no noise is present, the cylinder is likely in good condition.
This solenoid directional valve plays a critical role in the smooth operation of the radio-controlled grab, ensuring precise control over the hydraulic system. Regular maintenance and proper adjustments are necessary to keep the grab functioning efficiently. Always follow the manufacturer's guidelines for safe operation and troubleshooting.