Precautions For Welding Materials

1, stainless steel electrode is usually titanium and low hydrogen type two. Welding current as far as possible with DC power supply, is conducive to overcome the welding red and deep penetration. Titanium calcium type of the electrode is not suitable for all-position welding, only suitable for flat welding flat angle welding; low hydrogen type of leather electrode can do all-position welding.

2, stainless steel electrode in use should be kept dry. In order to prevent the occurrence of cracks, pits, pores and other defects, titanium calcium-type chemical coating before drying 150-250 ? drying 1h, low hydrogen type chemical coating before drying 200-300 ? drying 1h. Can not be repeated repeated drying, or easy to fall off the drug.

3, welding material welding clean, while preventing the electrode stained with oil and other dirt, so as not to increase the weld carbon content and affect the welding quality.

4, in order to prevent welding material heating and intergranular corrosion, welding current should not be too large, generally lower than the carbon steel electrode about 20%, the arc should not be too long, cold between the layers to narrow channel welding is appropriate.

5, arc when attention, not in the non-welded parts of the arc, the best choice with the same material welding plate arc to arc.

6, welding materials should be used as short as arc welding, arc length generally 2-3mm, arc is too easy to produce hot cracks.

7, welding material transport: short arc welding should be used, generally do not allow lateral swing, its purpose is to reduce the heat and heat affected area width, improve the weld resistance to intergranular corrosion and reduce the tendency of hot cracks.

8, dissimilar steel welding should be carefully selected electrode, to prevent improper selection of welding wire or high temperature heat treatment caused by s phase precipitation, the metal embrittlement. With reference to stainless steel and dissimilar steel electrode selection criteria for selection, and take appropriate welding process.

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