Understanding E908: Welding Electrode Specifications

E908

The designation E908 corresponds to multiple industrial and consumer products; the most common applications are welding electrodes and mobile phones. Below is a detailed breakdown of its core definitions and technical specifications in English:

1. Primary Definition: E908 Low-Alloy Steel Welding Electrode

English Full Name: E908 Low-Alloy High-Strength Steel Covered Arc Welding Electrode

Product Category: Shielded Metal Arc Welding (SMAW) Electrode

Core Standard: Complies with AWS A5.5/ASTM A5.5 (American Welding Society) specifications for low-alloy steel electrodes.

Key Technical Details (English)

Classification Logic:
- E: Indicates an SMAW electrode for steel.
- 90: Represents the minimum tensile strength of deposited metal: 90,000 psi (≈620 MPa).
- 8: Denotes the welding position (all positions: flat, horizontal, vertical, overhead) and current type (AC/DC reverse polarity).
Deposited Metal Properties:
- Tensile Strength: ≥ 620 MPa (90 ksi)
- Yield Strength: ≥ 550 MPa (80 ksi)
- Elongation: ≥ 18%
- Impact Toughness: ≥ 27 J at -20°C (charpy V-notch test)
Electrode Coating Type: Rutile-based coating, provides stable arc, low spatter, and smooth weld bead appearance.
Recommended Welding Parameters:Electrode Diameter (mm)Current Range (A, DC+)Welding Voltage (V)2.550–8020–243.280–12022–264.0120–18024–28
Pre-Welding & Post-Welding Requirements:
- Bake electrode at 250–300°C for 1–2 hours before use to remove moisture.
- Preheat workpiece to 150–250°C for thick plates (>12mm) to prevent cold cracking.
- Post-weld stress relief annealing (600–650°C) is recommended for high-stress components.
Typical Applications: Welding of high-strength low-alloy steels used in construction machinery, pressure vessels, bridge structures, and heavy equipment frames.

2. Alternative Definition: Samsung SGH-E908 Mobile Phone (2006)

English Full Name: Samsung SGH-E908 Slider Mobile Phone

Product Category: Feature Phone (GSM)

Release Date: Q3 2006

Key Specifications (English):

Display: 2.0-inch QVGA (240×320) TFT LCD, 262,144 colors, touch-sensitive navigation keys.
Camera: 2.0-megapixel rear camera, digital zoom, video recording (176×144 resolution at 15fps).
Memory & Storage: 80MB internal storage, expandable via microSD card (up to 2GB).
Connectivity: GSM 900/1800/1900 MHz, Bluetooth 2.0, USB 2.0, 3.5mm headphone jack (adapter required).
Battery: 800 mAh lithium-ion battery, up to 3 hours talk time, 250 hours standby time.
Design: Slider form factor, dimensions 93×45×16.5 mm, weight 93g, available in Black, Silver, Pink.
Additional Features: MP3 player, FM radio, SMS/MMS, Java MIDP 2.0 support, WAP 2.0 browser.