1, the electrode should not be placed directly inside the baking temperature
Electrode prior to use to make the necessary baking and drying the alkaline electrode placed in temperature controlled at 100 ° C insulation barrel, used with the check.
Unused alkaline electrode placed in the air a long time, easy to absorb moisture, but also the next day re-baking. By removing the electrode within the water and water of crystallization, in order to ensure the quality of the welding process, arc stability and weld metal.
But it is noteworthy baking electrodes, welding rod should be placed in the electric oven is gradually warming up, should not be placed directly inside the baking temperature, especially due to improper care and serious damp electrodes, due to a sudden the high temperature , too late to evaporate moisture and sudden expansion, So that the electrode drug skin rupture.

2, drying of the electrode should not be exposed too long in the air
After drying of the electrode should be placed in the drying box or deposited in the electrode insulation barrel used with the check. If the drying of the electrode exposed to the air long storage time, the electrodes drug skin will quickly get damp, so that a significant increase in the diffusible hydrogen content in the electrode drug skin, especially exposed to the air the first 1 to 2 hours to absorb moisture the fastest, will this The moisture absorption of the electrode used for welding of important structures, the welding quality will be adverse effects. Therefore, in the welded construction, the drying of the electrode is removed from the dry box, it should be used up within two hours of high strength steel welding rod should be used within 1 hour, or need to re-baked; or electrode from out of the Welding Electrode box, immediately placed in 150 ° C in the electrode insulation tube insulation storage, used with the check should not be stored in the open for too long.

3, subject to certain conditions, restrictions can not be cleaned low carbon steel weldments, should not use alkaline electrode
Alkaline welding rod welding process less sensitive to rust, oil, water, clean-up requirements are also higher on the surface of the groove, if the weldment is not completely clean up, it is easy to produce holes and other defects in the welding process. Therefore, subject to certain conditions, restrictions can not be cleaned low carbon steel weldment surface there are oxide, oil, dirt, the inappropriate use of alkaline electrode. Should be selected welding process better acid electrode, acid electrode anti-stomatal performance, not to rust, grease and moisture sensitivity.

4, for the important structural welding on impact toughness and crack resistance require a higher, should not use the acid electrode
Acid electrode drug skin contains more oxides of strong oxidation, the oxygen content of the weld metal more alloying elements burning larger. Drug skin dioxide part of the silicon in the form of silicon oxide inclusions in the weld, therefore, the weld of the poor mechanical properties, especially ductility and impact toughness than the alkaline electrode. In addition, the acid electrode drug skin does not contain fluorite (CaF2), the dehydrogenase capacity is low; weld metal hydrogen content is high, resistance to cold cracking; and desulfurization elements manganese content in the weld, the desulfurization effect. Therefore, the thermal crack resistance is also poor.

Welded structure should not use the acid electrode should be used in low oxygen content of weld metal, alloy transition coefficient, low sulfur content and hydrogen content of alkaline electrode. Weld metal mechanical properties and crack resistance than the acid electrode.

5, should not use carbon steel electrode welding stainless steel weldments.
Welding of austenitic stainless steel, welding generally do not need to take special measures of the process. However, if the Mig Electrode is the inappropriate choice will produce welding defects. For example, the choice of carbon steel electrode welding stainless steel, stainless steel will produce intergranular corrosion by intergranular corrosion of stainless steel will lose the ability of anti-corrosion, and will fracture along the grain boundaries under stress, the intensity is almost completely lost, is an austenitic the stainless steel is the most dangerous failure modes.
Since carbon is caused by intergranular corrosion of the main elements, and therefore, the welding of stainless steel should be selected low-or ultra-low carbon stainless steel electrode, such as the Olympic 102, Olympic 132, Olympic 002 electrode.