First, Welding cracks and pores are generated.
The moisture absorbed by the welding rod becomes gas under the action of the welding arc heat, which decomposes hydrogen, resulting in the formation of welding cracks and pores. This is especially true for alkaline electrodes. The welding rod is sealed with a polyethylene plastic bag when it is packaged, and it cannot guarantee a long-term complete moisture-proof.
Second, Various indexes of mechanical properties are low.
Tianqiao welding
A simple way to check the damp condition of the welding rod on site:
(1) Check the packaging of the welding rod. If the packaging is damaged, the welding rod must absorb moisture seriously.
(2) Put a few welding rods in your hands and roll them, and the welding rods lost the crisp metallic sound after absorbing moisture.
(3) Take a welding rod and bend slightly by 10-15 degrees. If there is a clear cracking sound when bending, it means that the welding rod is relatively dry.
(4) Take a welding rod to the ground and observe its bounce force. The dry rod has better bounce force and higher rebound.
(5) Connect the electrode to the welding circuit and short-circuit for a few seconds. If water vapor appears on the surface of the coating, it is a non-dry electrode.
(6) Take a welding rod for trial welding directly. If it is a damp welding rod, the coating will burst or fall off in blocks during the welding process, and produce more water vapor.
(7) Observe the surface of the end of the welding core to see if there is rust; you can also knock off the coating and directly check whether the welding core is rusted.
(8) Check during the welding operation, the process performance of the damp electrode will have the following changes:
●At the same current value, the arc blowing force becomes larger and the penetration depth increases;
●The number of splashes increases and the particles become larger;
● For acid electrodes, the slag coverage is poor, and the weld shape becomes poor;
● For low-hydrogen type electrodes, there are many small holes on the inner surface of the slag (the side that is in contact with the weld).
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Post time: Jul-01-2021
