I. Product Overview
ER347 is a 20Cr-10Ni-Nb type stainless steel solid CO₂ gas shielded welding wire. Based on the classic MG308 welding wire, it innovatively adds niobium (Nb) element, which can effectively improve the resistance to intergranular corrosion. It also has the advantages of stable arc, low spatter, beautiful weld appearance and adaptability to all-position welding. Widely used in high-precision welding scenarios such as pressure vessels and medical equipment, it provides a reliable welding solution for industrial operations.
II. Core Advantages
Superior Corrosion Resistance
The niobium element can fix carbon, preventing the formation of chromium carbide from the combination of carbon and chromium, thus significantly enhancing the resistance to intergranular corrosion. Combined with the 20Cr-10Ni alloy system, it can adapt to complex working conditions such as humidity, acid and alkali environments, and is not easy to rust during long-term use.
Excellent Welding Process Performance
The arc burns stably without drift, and the spatter is extremely low, which reduces the post-welding cleaning time. The weld formation is smooth and flat, which can meet the high-precision appearance requirements without additional grinding, reducing the cost of secondary processing.
All-Position Welding Adaptability
It supports all welding positions including flat welding, vertical welding, horizontal welding and overhead welding. No frequent parameter adjustment is required, enabling flexible adaptation to the welding needs of different structural parts and ensuring consistent welding quality in multiple scenarios.
III. Detailed Specifications & Parameters
1. Basic Information
| Item | Specification Details |
|---|---|
| Place of Origin | Zhejiang, China (Mainland) |
| Model Number | ER347 |
| Product Name | AWS ER347 Stainless Steel Solid CO₂ Gas Shielded Welding Wire |
| Weight | 5kg / 15kg |
| Packaging | 5kg per plastic box |
| Color | Silver Grey |
| Deposited Metal Composition | In line with international standards |
| OEM Service | Customization accepted |
2. Chemical Composition (Mass Fraction, %)
| Element | Standard Requirement | Test Value |
|---|---|---|
| Carbon (C) | ≤0.08 | 0.05 |
| Manganese (Mn) | 1.0-2.5 | 1.78 |
| Silicon (Si) | 0.3-0.65 | 0.36 |
| Chromium (Cr) | 19.0-21.5 | 19.60 |
| Nickel (Ni) | 9.0-11.0 | 12.50 |
| Copper (Cu) | ≤0.75 | 0.75 |
| Molybdenum (Mo) | ≤0.75 | 2.5 |
| Phosphorus (P) | ≤0.03 | 0.019 |
| Sulfur (S) | ≤0.03 | 0.014 |
3. Mechanical Properties
| Performance Index | Standard Requirement | Test Value |
|---|---|---|
| Tensile Strength | ≥520MPa | 580MPa |
| Elongation | ≥30% | 38% |
IV. Storage Specifications
1. Environmental Requirements
Temperature: 5-30℃; avoid areas with sudden temperature changes such as heating vents and air-conditioning outlets.
Humidity: Relative humidity ≤60%; keep the warehouse dry and well-ventilated, and stay away from moisture-prone locations like doors, windows and air vents.
Cleanliness: Do not store together with corrosive substances (such as acids, alkalis and salts) and oily materials; clean up dust and metal debris regularly.
2. Packaging & Stacking
Unopened Products: Keep the original packaging (plastic box + sealing film) intact. Use pallets to raise the products to be at least 10cm above the ground, and the stacking height shall not exceed 3 layers.
Opened Products: Put the remaining welding wire back into the original box and seal it in time, or transfer it to a special moisture-proof box (with desiccant inside), and use it up within 7 days.
3. Inspection & Protection
Regular Sampling Inspection: Check the integrity of the packaging and whether there is rust on the surface of the welding wire (light yellow spots need to be handled immediately) every week.
Handling Requirements: Handle with care to avoid deformation of the welding wire spool due to collision; wear clean gloves during operation and do not touch the welding wire directly with hands.
V. Usage Guide
1. Preprocessing Steps
Wire Cleaning: Check the surface of the welding wire; wipe off rust or oil with absolute ethanol. For slight oxidation, light grinding is allowed (grinding depth ≤0.02mm).
Gas Preparation: Use industrial-grade CO₂ gas with a purity of ≥99.5%. Invert the gas cylinder for 1-2 hours and then release the water at the bottom (at least once a month).
Equipment Inspection: Ensure the wire feeding mechanism is smooth and the pressure of the wire feeding wheel is appropriate. Clean the spatter in the welding torch nozzle and match the wire diameter (e.g., 1.2mm wire is suitable for φ16mm nozzle).
2. Recommended Welding Parameters (Taking 1.2mm Wire as Example)
| Welding Position | Current (A) | Voltage (V) | Welding Speed (mm/min) | Gas Flow Rate (L/min) |
|---|---|---|---|---|
| Flat Welding | 180-220 | 24-26 | 300-400 | 15-20 |
| Vertical Welding / Horizontal Welding | 150-180 | 22-24 | 250-350 | 18-22 |
| Overhead Welding | 130-160 | 20-22 | 200-300 | 20-25 |
3. Operation Skills
Torch Angle: 15-20° forward tilt for flat welding, 80-90° vertical to the base metal for vertical welding, and 10-15° backward tilt for overhead welding.
Weld Pool Control: Maintain an elliptical weld pool. If pores appear, check the gas supply and wire cleanliness. If the weld formation is rough, reduce the welding speed or increase the voltage.
Ending Treatment: Adopt the "decay arc ending" method (gradually reduce current and voltage). Clean the spatter after the weld cools to room temperature, and do not directly cool the weld with cold water.
VI. Application Fields
Pressure Vessels: Chemical storage tanks, boiler liners, etc., which can withstand high temperature, high pressure and medium corrosion.
Medical Equipment: No harmful impurities precipitate, and the weld is smooth and easy to clean, meeting the medical and health standards.
Other High-Precision Scenarios: Food machinery, marine engineering equipment, etc., suitable for welding various stainless steel base materials.
VII. Corporate Services
Customization Service: OEM is supported, and product specifications and packaging can be adjusted according to needs.
Procurement Advantages: Wholesale discounts are available, balancing quality and cost with high cost-effectiveness.
Quality Assurance: Attach authoritative test reports from institutions such as SGS, with traceable quality.
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