Preheat A36 untuk SMAW (non-low-hydrogen) — up to 3/4"

SMAW (Non-Low-Hydrogen)

Non-low-hydrogen SMAW (E6010/E6011) uses cellulosic electrodes with higher hydrogen potential, assigned to Category A in Table 5.11.

For common structural shapes and plate, non-low-hydrogen SMAW with E6010 or E6011 excels at root passes on open-root groove welds where burn-through control matters. Vertical-up technique with a slight weave keeps the puddle manageable. Rod consumption runs about 10-12 electrodes per pound of weld metal deposited. Electrode stubs should be no shorter than 2 inches to maintain adequate arc length control.

SMAW Tips for Common Structural Steels

For A36 structural steel (36 ksi yield), E6010 at 80–130 A (1/8" rod) is the preferred root-pass electrode for open-root groove welds, field tack welds, and erection connections where rod oven access is impractical. E6011 runs on AC or DC — an important advantage for generator-powered field welders with AC output. Category A applies: 32°F minimum up to 3/4", 50°F up to 1-1/2".

Typical values for reference — always verify against your approved WPS and electrode manufacturer data.

Why SMAW (non-low-hydrogen) for A36 at up to 3/4"

Why SMAW (non-low-hydrogen) for A36 at up to 3/4"? SMAW (non-low-hydrogen) delivers 3-5 lb/hr deposition — compared to SAW at 15-40 lb/hr. Position capability: all positions. Suitability: field and shop.

A36

ASTM A36 is the most commonly specified structural steel in North America, with a minimum yield strength of 36 ksi and 58-80 ksi tensile range. It appears in both Category A (non-low-hydrogen SMAW) and Category B (low-hydrogen processes) of Table 5.11. A36 is available as plate (up to 8" thick), W-shapes, channels, angles, and bars from virtually every domestic mill. Its moderate carbon content (0.26% max for shapes, 0.25% max for plate up to 3/4") and typical carbon equivalent of 0.35-0.42 give it good weldability across all prequalified processes. A36 plate thicker than 1-1/2" carries a slightly higher carbon limit of 0.29%, while plate from 3/4" to 1-1/2" stays at 0.25% max.

Mengapa Preheat Ini untuk A36 dengan SMAW

Widely used structural carbon steel with 36 ksi yield and 0.26% max carbon. At this thickness, SMAW with non-low-hydrogen electrodes places the joint in Category A of Table 5.11. The minimum preheat of 32°F compensates for the higher diffusible hydrogen from cellulosic electrode coatings. The thicker the material, the longer hydrogen takes to escape the heat-affected zone, which is why preheat rises with thickness even for this common grade.

Aplikasi Umum untuk A36

Common in angle-to-gusset fillet welds, beam web clip angles, stiffener plates, base plate bearing connections, light bracing members, stair stringers, handrail posts, and miscellaneous steel fabrication. A36 plate is the default choice for connection elements such as shear tabs, moment end plates under 36 ksi demand, and simple beam-to-column seated connections. In retrofit and renovation, A36 angles and channels are standard for reinforcement brackets and framing infill. Typical shop drawing callouts include 3/8" and 1/2" A36 plate for gussets, 5/16" fillet welds on clip angles, and partial joint penetration groove welds on base plate stiffeners. A36 is so ubiquitous that most structural steel shops maintain permanent inventory in multiple thicknesses from 1/4" through 2" plate. Fillet weld sizes on A36 connections typically range from 3/16" minimum to 5/8" for heavy gusset-to-column welds, with E70XX electrodes providing significant overmatching strength.

Mengapa Preheat Penting pada up to 3/4"

Thin material sheds heat quickly, allowing hydrogen to escape the HAZ readily — lowest preheat tier in Table 5.11.

Mengapa 32°F untuk A36?

Preheat minimum 32°F (0°C) berarti tidak diperlukan pemanasan awal aktif di atas kondisi beku. Tabel 5.11 Kategori A pada ketebalan ini menetapkan minimum ambien karena A36 dengan SMAW bukan hidrogen rendah memiliki keuletan cukup dan karbon ekuivalen rendah sehingga risiko retak hidrogen minimal. Sesuai catatan kaki (a), jika bekerja di bawah 32°F, panaskan awal sambungan hingga setidaknya 70°F (20°C) dan pertahankan selama pengelasan.

Baja Lain dengan SMAW (non-low-hydrogen) pada up to 3/4"

A36 dengan SMAW (non-low-hydrogen)

Coba Kombinasi Berbeda

Gunakan kalkulator preheat interaktif untuk mencari kombinasi baja, proses, dan ketebalan dari D1.1:2025 Tabel 5.11.

Panduan Pengelasan A36