ESCO 12 Series alloys are used to provide strength and hardness to a variety of ESCO mining, construction, logging, conveying and dredging tools. They have been developed for toughness, with hardness ranging from 229-550 BHN. Most ESCO teeth, adapters, rippers, blades and end bits are made of durable 12 Series alloys. Some are weldable and some are not.
ESCO 14 Series alloy castings are manganese steels which "work-harden" on impact and thus maintain surface hardness and wear resistance. ESCO 14 Series alloys are used in select bucket applications, such as shovel dipper doors, lips and fronts, brushings, and other applications.
By following these welding instructions you should have no difficulty welding and maintaining ESCO products. If questions arise that are not fully answered here, please contact your ESCO dealer or ESCO direct.
The following requirements apply to any one layer of weld, including root and final. "One layer" is generally intended to mean a single plane of weld stringer beads, but suitable interpretation must be used if the shape results in a curving layer.
LINEAR DISCONTINUITY: No cracks, including crater cracks, are allowed in welds or heat affected zones. No other linear discontinuity in these areas shall exceed 6mm/.25" in length.
POROSITY: Porosity shall not exceed (4) holes in every 100 mm/4.0" of length of a single weld bead. No single void shall exceed 1.5 mm/.06" in diameter.
SLAG: No visual slag in any layer is allowed.
UNDERCUTTING: Undercutting shall not exceed 1.5 mm/.06" for material over 13 mm/.50" in thickness.
ROLLOVER: Rollover or weld overlap shall not exceed 1.50 mm/.06" beyond the fusion line of the weld.
WELD SPATTER: No bead of weld spatter shall exceed 0.8 mm/.03" in diameter. The scatter density of beads of acceptable size shall not exceed 25 per 36 sq. inches/230 sq. cm.
GRINDING: Grinding requirements shall be as specified on the applicable drawing. If grinding must be performed in only certain directions, these requirements will also be specified on the drawing.
OVERLAY PLATE ATTACHMENT: Overlay plate can be an effective method of prolonging the life of some ESCO products in certain applications. However, improper design, installation, and/or maintenance of the overlay plate may contribute to premature failure of any adjacent ESCO product.
Refer to and follow the recommendations of the specific overlay plate manufacturer for proper overlay plate design, installation, and maintenance. Cases may exist where the recommendations of the overlay plate manufacturer conflict with ESCO requirements or procedures. If a conflict exists, follow the ESCO requirements.