A chromium stainless steel with corrosion (oxidizing acids, organic acids, cavitation), heat-resistant and wear-resistant function. Typically used in power plants, chemical, oil and other equipment and materials. The welding of chromium stainless steel is poor, should pay attention to the welding process, heat the premise and the selection of suitable welding.
2, chrome 13 stainless steel welding, hardening of large, easily cracks. The use of the same type of chromium stainless steel electrode (G202, G207) welding, necessary to carry out about 700 ℃ preheat and post weld slow cooling processing more than 300 ℃. Weldment can not weld heat treatment, you should make use of chrome-nickel stainless steel electrode (A107, A207).
3 17 stainless steel, chrome, to improve the corrosion function and welding appropriate increase in the right amount of chaos elements of Ti, Nb, Mo, welding better than the chrome 13 stainless steel. Using the same type of chromium stainless steel electrode (G302, G307) should be carried out more than 200 ℃ preheat and post weld tempering around 800 ℃. Weldment can not be heat treated, you should make use of chrome-nickel stainless steel electrode (A107, A207).
4, chrome-nickel stainless steel electrode has good resistance to corrosion and oxidation resistance, widely used in chemical, fertilizer, petroleum, medical machinery manufacturing.
5, the chrome-nickel stainless steel welded carbide precipitation by repeated heating and reduce the corrosion resistance and mechanical function.
6, drug skin of chrome-nickel stainless steel with titanium calcium type and low-hydrogen type. Titanium calcium type can be used for AC-DC, AC welding penetration is shallow, while easily redness, so as far as possible with DC power supply. Diameter of 4.0 and below can be used for all position welding of 5.0 and above for flat butt and fillet weld.
7, the electrode should be used to keep dry, lime-titania type shall be approved by the dry one hour of 150 ° C, low hydrogen type should be dried by 200-250 ° C 1 hour (can not be repeated drying, or medicine skin cracks easily peel off) to prevent the Welding Electrode drug skin sticky oil and other dirt, so as to avoid causing the weld to increase the carbon content and impact of welding quality.
8, in order to prevent the heating eyes erosion, welding current is not too large, about 20% less than the Carbon Steel Electrode , the arc should not be too long, rapid cooling layer, a narrow welding Road is appropriate.
The so-called "expired" does not refer to the storage time exceeds a certain time limit, but rather refers to the quality of different levels of change (deterioration). Various types of electrodes longer storage time, and sometimes in the white crystalline (scared) This is usually caused by the water glass electrode surface, the crystallization is not harmful, it means that the electrode storage time is very long and wet performance. 1, should be stored for many years the electrode process test electrode according to the specified temperature for drying. Welding did not find abnormal changes in the electrode process performance, such as drug leather successful block off phenomenon, as well as pores, cracks and other defects, the electrodes mechanical properties are generally guaranteed. 2, the Welding Electrode due to damp welding core minor rust, and basically does not affect performance, but if the high quality of welding, it should not be used. 3, the electrode damp rust is severe, the discretion to downgrade to use or be used for general component soldering. The best national standards to test the mechanical properties, and then determine the scope of its application. 4, if the welding paint contains a large number of iron and hydrogen content in the high relative humidity and longer storage time, electrode damp serious, even paint, corrosion, electrode drying, welding, continues to generate pores or spread high, and thus have to be scrapped. Required to improve the packaging to prevent electrode to absorb moisture in storage must be properly kept. 5, the Welding Materials of various types of serious deterioration, drug skin has been seriously off phenomenon, this batch of welding rod should be scrapped.