Stainless steel electrode can be divided into chromium stainless steel welding rod and chrome-nickel stainless steel electrode, who meet the national standard, according the provisions of GB GB/T983-1995 assessment of these two types of electrodes.
Chromium stainless Nickel Electrodeschromium stainless steel corrosion (oxidizing acids, organic acids, cavitation) heat resistance and corrosion resistance. Usually selected as power plants, chemical, petroleum and other equipment and materials. The general case of chromium stainless steel weldability poor, should pay attention to the welding process, heat treatment conditions and the appropriate choice of welding electrodes.
1, martensitic stainless steel welding:
The martensitic stainless steel including chromium containing 5 to 9% in the chromium steel containing 12% Cr, high-chrome steel. Such steel hardened tendency, after welding, is easy to produce a high hardness martensite and bainite so that brittleness increases, the residual stress is also large, easy to produce cold cracks. Must be so general before welding preheat and inter-layer insulation, high-temperature tempering after welding yet cooled.
2, 13 chrome stainless steel welding:
Such the chromium steel welding after sclerosing easily cracks, using welding of the similar chromium stainless steel electrode (A202, A207), you must preheat and post-weld above 300 ℃ and 700 ℃ tempering slow cooling. If the weldments can not weld treatment, the application of chromium stainless steel electrode welding (A107, A207).
3, 17 chrome stainless steel welding:
Such chromium steels are generally for improving the corrosion resistance and weldability, plus the amount of the stabilizing elements titanium, niobium, molybdenum, weldability than chromium 13 steel as well, and can be the same type of chromium stainless steel electrode (A302, A307) welding. Before welding, weldment should be about 200 ℃ preheat about 800 ℃ tempering after welding. Can also be used chrome-nickel stainless steel electrode (A107, A207), post-weld heat treatment.
Chrome-nickel stainless steel electrode for use
Chrome-nickel stainless steel electrode with good corrosion and oxidation resistance, it is widely used in the manufacture of chemicals, fertilizers, petroleum, food, medical devices and equipment. In recent years, with China's industrial development, the chrome-nickel stainless steel electrode varieties there are more than thirty kinds, basically meet the construction needs of our country.
Chrome-nickel stainless steel welding by repeated heating, easy precipitation charcoals, thereby reducing the corrosion resistance and mechanical properties, therefore, the chrome-nickel stainless steel welding equipment operating conditions (temperature and medium types, etc.) should be based on properly select the welding rod, and when used to note the following:
1, stainless steel electrode coating usually titanium calcium type and two low-hydrogen. Titanium calcium typeStainless Steel Welding Electrodesgenerally shallow arc wear degrees, suitable for sheet overlooking welding (manual welding), are not suitable for all-position welding. Stainless steel core resistance the AC welding DC welding easy red, so, as far as possible, using DC welding. The low hydrogen type stainless steel electrode suitable for the above board in all position welding.
2, all kinds of stainless steel welding rod should be used to keep dry, titanium calcium type coating should bake 1 hour at 150 ~ 250 ℃, the low hydrogen drugs skin shall be subject to 200 ~ 300 ℃ bake 1 hour (not repeated drying or drug skin easy to crack and fall off), to prevent the electrode coating glue oil and other dirt, so as not to the the weld increase the amount of carbon and affect the quality of welding.
To prevent heating intergranular corrosion, welding current is not too large, generally about 20% lower than the carbon steel electrode, at the same time the arc is not too long, rapid cooling layer to the narrow channel welding appropriate.
4, the weld ferritic amount, according to the chemical composition from She Feier and flute Lung Find.

Stainless Steel Welding Electrodes for welding repair and surfacing including structural steel welding rod, heat-resistant steel electrode, stainless steel electrode, welding electrodes, cast iron welding rod, nickel and nickel alloy electrode and special purpose welding rod, etc..

    The electrode model based electrode based national standards, to reflect the the electrode main characteristics of a representation. Electrode models include the following meanings: Electrode category electrode characteristics (such as welding core metal type, the use of temperature and chemical composition of the deposited metal or tensile strength), the drug skin type and the welding power source. Model representation of the different types of rods are also different.

1, carbon steel welding rod Model

    According to the requirements of the GB/T5117-95 "carbon steel electrode standard, carbon steel welding rod model based on the mechanical properties of the deposited metal, the drug skin type, welding position, and types of welding current division. The first letter "E" electrode; first two digits indicate the minimum tensile strength of the metal, deposited in kgf / mm 2 (1kgf/mm 2 = 9.81MPa); the third digit welding position, 0 "and" 1 "for all-position welding (can Ping, Li Yang, cross welding)," 2 "for flat welding and fillet welding," 4 "is suitable for vertical down welding; Third The fourth digit combination indicates the type of welding current and medicated skin type. Additional letters after the fourth digit electrodes with special provisions, such as "R" means resistance to moisture absorption electrode; additional "-1", said the impact properties of the special provisions of the welding rod.

2, low-alloy steel electrodes Model

    Standard provisions GB/T5118-95 "low-alloy steel electrodes, low alloy steel welding rod model based on the mechanical properties of the deposited metal, chemical composition, the drug skin types, welding position and current types of. The first letter "E" indicates the electrode, the first two digits of deposited metal minimum tensile strength; the third digit welding position "0" and "1" for all-position welding (flat welding, vertical welding overhead welding and cross welding), "2" for flat welding and fillet welding; third, fourth digit combination indicates the type of welding current and medicated skin type; suffix letters for the classification code of the deposited metal chemical composition and dash "-" previous figures separately. If there are additional chemical components, additional chemical components are directly represented by element symbols, and a dash "-" and separate from the front of a suffix letter.

3, stainless steel welding rod Model

    According to standard requirements GB/T983-95 "stainless steel electrode, stainless steel electrode according to the chemical composition of the deposited metal the drug skin types, welding position and the welding current types of models. The first letter "E" stands electrode "E" behind the numbers indicate the chemical composition of the deposited metal classification code, there are special requirements for the chemical composition of the element symbols placed behind the numbers. Dash "-" behind the two figures represents the type of Nickel Electrode coating, welding position, and types of welding current.
   Stainless steel electrode Model appended suffix (15,16,17,25,26) electrode the drug skin types and types of welding power supply, see table 1 - 1. Suffix 15 indicates alkaline, anti-DC-level resistance welding; suffix 16 alkaline or titanium or titanium calcium type, AC and DC; suffix 17 drug skin type 16 variant, said titanate type coating (SiO2 instead of the drug skin types 16 TiO2), welding melting rate, excellent anti-redness, AC and DC. Suffix 25 and 26 drug skin components and operating characteristics similar to the electrode and the drug skin types 15 and 16, the drug skin types 15 and 16, a description of the wire is also suitable for the drug skin types 25 and 26.