Welding rod, is in the metal core will be uniform, to the heart of the coating on the core.The welding core is the metal core of the welding rod, in order to ensure the quality and performance of the welding seam, the content of each metal element in the welding core has strict provisions, especially to the harmful impurities (such as sulfur, phosphorus, etc.) content, there should be strict restrictions, better than the base material.The quality of welding rod has a great impact on the quality and performance of welding seam, this issue we talk about how to identify the quality of welding rod.

 

A simple method to check the quality of electrode

 

1.The test of the actual welding seam is to check the quality of the electrode through the actual welding seam. The electrode has good quality, the arc combustion is extremely stable when welding, the core and the coat melt evenly, few spatter, the welding seam is formed well, and the slag is easy to be removed.

 

2.To test the strength of the coating, lift the electrode one meter high and drop it freely on the smooth thick steel plate. If the coating does not fall off, it will prove that the coating strength meets the quality requirements.

 

3.Surface inspection, the surface should be smooth and delicate, no porosity and mechanical damage, no eccentricity, no corrosion of the core.

 

4.Physical and chemical inspection, when welding important welding parts, the weld metal should be carried out chemical analysis and mechanical property reinspection, in order to check the quality of welding rod.

 

Second, the identification of the deterioration of the welding rod method

 

1.Put a number of welding rods in the palm of each other roll, such as a clear metal sound, that is, dry welding rods, such as a low rustle, wet welding rods.

 

2.The electrode in the welding circuit in a few seconds, such as granular spots appear on the surface of the coating, it is a wet electrode.

 

3.There are often rust marks on the core of wet electrode.

 

4.For the coating thickness of the electrode, slowly bending to 120 degrees, such as a large piece of paint off or paint surface without cracks, are damp electrode, dry electrode in light bending, there is a small cracking sound, continue to bend to 120 degrees, in the tension of the side of the drug skin has a small crack.

 

5.Falls off when welding such as coated into pieces, or to produce more quantity of water vapor, electrode of be affected with damp be affected with damp, be affected with damp be affected with damp electrode, if coated, should be discarded, may be affected with damp be affected with damp but not serious, but after being dry reoccupy general electrode welding core have slight rust, welding basic also the quality is good, but for the important projects with low hydrogen electrode, rust after will not be used.