ENiCrMo-6 SMAW Rod

 

From the core classification of welding materials, ENiCrMo-6 belongs to nickel-based alloy coated electrodes, which are consumable welding materials dedicated to manual arc welding (SMAW). This classification can be clearly distinguished from three core characteristics: ​

 

1. Morphology and structure: It is composed of "metal welding core + outer coating" - the welding core is a nickel-based alloy (containing elements such as Ni, Cr, Mo, etc.), which determines the basic properties of the deposited metal; the coating is a coating mixed with mineral powder, alloy powder, etc., which produces protective gas and slag by melting during welding, replacing external protection measures (such as argon gas in TIG welding). ​

 

2. Adaptation of welding principle: During manual arc welding, an arc is generated between the electrode and the base material, and the high temperature melts the welding core to form a molten pool. At the same time, the coating decomposes to produce protective gases such as CO₂ and H₂O (isolated from the air), and forms slag covering the surface of the weld (to prevent secondary oxidation during cooling). This "self-protection" feature makes it unnecessary to rely on complex gas protection equipment, and is particularly suitable for mobile scenarios such as field repairs and high-altitude operations. ​

 

3. Industry standard positioning: It complies with the definition of "coated nickel-based welding rods" in AWS A5.11 (American Welding Society Nickel and Nickel Alloy Welding Rod Standard), and forms a clear distinction with ER series solid welding wires (such as ERNiCrMo-6, corresponding to TIG welding) and submerged arc welding wires. The latter two need to rely on external protection (gas or flux), while the coating of ENiCrMo-6 is the core protection mechanism. ​
In short, it is like a "welding material with its own protective cover". It achieves independent welding with the coating, and is the core choice of manual arc welding in the welding of materials such as nickel-based alloys and corrosion-resistant steel.

 

1. Basic connection function: Reliable combination of dissimilar/similar materials
It can weld nickel-based alloys (such as Inconel 625), low-temperature steel (such as 9% nickel steel), stainless steel and other materials, and form a molten pool through the melting of the welding core, so that different parent materials or similar parent materials can be integrated into a whole. Whether it is the dissimilar welding of nickel-based alloys and low-temperature steel in LNG storage tanks, or the splicing of similar nickel-based alloys in chemical equipment, continuous and dense welds can be formed to meet the structural bearing requirements - the tensile strength of the weld can reach more than 650MPa, ensuring that the welding part will not become a structural weak point.​
2. Self-contained protection function: replace external protection measures to ensure the purity of the weld ​
The coating is the core carrier of its protection function: during welding, the coating melts and decomposes, on the one hand, releasing inert gases such as CO₂, forming a "gas barrier" around the molten pool to isolate oxygen and nitrogen in the air (to avoid pores and nitrogen embrittlement in the weld); on the other hand, it forms molten slag, which covers the surface of the high-temperature molten pool like a "protective film" to prevent secondary air intrusion during the cooling process, while reducing the oxidation and burning of the weld metal. This "gas + slag" dual protection does not require it to rely on external argon and other protective equipment, and can also stably weld in complex environments such as field repairs and high-altitude operations.​
3. Performance enhancement function: giving welds extreme environmental adaptability​
The alloy elements such as nickel, chromium, and molybdenum in the welding core will be integrated into the weld, giving the weld metal high performance matching the parent material:​
•Corrosion resistance enhancement: More than 16% of molybdenum can inhibit pitting caused by chloride ions, and about 20% of chromium forms a passivation film to resist acid and alkali corrosion, extending the life of the weld in strong corrosive environments such as seawater and hydrochloric acid by 3-5 times;​
•Low temperature enhancement: The nickel-based matrix allows the weld to maintain high toughness (impact energy ≥160J) at a low temperature of -196℃, avoiding brittle fracture of LNG storage tanks, cryogenic pipelines and other equipment in extremely cold environments;​
•Crack resistance enhancement: The alloy powder in the coating can refine the weld grains, and with the low-hydrogen coating design (hydrogen content ≤8ml/100g), it can reduce defects caused by hydrogen-induced cracks and thermal cracks during welding, especially suitable for thick plate welding and high-stress structures.​

In simple terms, it can not only "weld materials together", but also make the welding parts "weld firmly and last longer" in extreme environments such as corrosion, low temperature, and high pressure, which is the key guarantee for the safe operation of industrial equipment. ​

 

 

• Efficiency innovation of petrochemical giant: A large petrochemical enterprise adopted ENiCrMo-6 nickel-based welding rods in the pipeline welding project of its core refining unit. The person in charge of welding technology of the enterprise reported: "In the past, other welding rods were used, the welding efficiency was low, and the weld quality was unstable, and rework was often required. After adopting ENiCrMo-6, the welding efficiency has increased by about 30%. Its arc is stable and the blowing force is strong, so our welders can operate more smoothly, which greatly shortens the welding time of each weld. At the same time, the downtime of the unit has been greatly reduced. In the past, there were at least 3 unplanned downtimes caused by weld problems every year, but now they have been almost eliminated, and the overall production cost has been significantly reduced."
• Cryogenic trust in the energy industry: In the tank construction project of a certain LNG (liquefied natural gas) receiving station, the construction party has extremely high requirements for welding quality in low temperature environment. The project welding engineer commented: "The operating temperature of LNG tanks is as low as -162℃, which is a great test for the low-temperature toughness of welded joints. ENiCrMo-6 nickel-based welding rods fully meet our needs, and the low-temperature impact toughness of its weld metal at -196℃ far exceeds the standard requirements. According to the test of a third-party testing agency, the impact absorption energy reached 180J (the industry standard is generally 150J), and the welding process performance is excellent, the slag is easy to remove, and the shape is beautiful, which makes us full of confidence in the long-term safe operation of the tank."
• Anti-corrosion pioneer in marine engineering: A company focusing on the construction of offshore platforms selected ENiCrMo-6 in the welding operation of the seawater treatment system. The company's technical director shared: "The marine environment is harsh, and seawater contains a large amount of chloride ions, so ordinary welding rods are difficult to resist corrosion. ENiCrMo-6 performed amazingly. After a year of actual operation, the weld surface only slightly changed color, without any signs of pitting or corrosion cracking. Compared with the welding rods used before, its corrosion resistance has been significantly improved, effectively extending the maintenance cycle of the equipment from the original six-month maintenance to the current two-year maintenance, greatly reducing the cost and risk of offshore operations."

 

 

1. Slag and spatter cleaning
Use a stainless steel wire brush (carbon steel brush is prohibited to avoid iron ion contamination) or a special chisel to remove solid slag on the surface of the weld, paying special attention to the residue in hidden areas such as the weld root and corners;
For welding spatter (metal particles attached to the parent material or weld surface), use an angle grinder to gently grind and remove it - spatter residue will destroy the surface flatness and easily form "crevice corrosion" in a corrosive environment (the tiny gap between the spatter and the parent material will gather chloride ions).
2. Surface cleaning
Rinse the weld and the surrounding area with clean water to remove dust generated by grinding; if flux is used during welding, soak and scrub with hot water (60-80℃) to avoid soluble salts (such as sodium salts) in the flux (salts will accelerate electrochemical corrosion);
If subsequent painting or lining construction is required, wipe the surface with alcohol or a special cleaning agent to ensure that there is no oil or moisture (oil will affect the adhesion of the coating).

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