welding-alloys.com 10 Joining by other welding techniques, processes, and configurations is possible depending on application, installation area, liner thickness, and accessibility. In all cases, structural welds must be performed on the base material of the wear plate Only. Welding directly on the hardfaced surface will result in low-strength joints, severe cracking, and potential equipment damage due to weld failure. The only acceptable welding on the hardfaced surface is capping, done using a Welding Alloys hardfacing consumable (e.g., HARDFACE HC-O) to protect exposed bolt heads, weld joints, and fitment gaps from wear. Key Guideline Avoid contamination of weld joints by the hardfaced overlay. Even small amounts of hardfacing material in the weld metal can lead to brittle joints and failure. Recommended practice Use Welding Alloys consumables (see Table 6) that tolerate minor contamination only when necessary — always aim to avoid contamination entirely. Once the joint is completed, the remainder of the gap should be filled with the relevant hardfacing consumable to maintain wear protection. Examples Use HARDFACE L-O when less cracking is required in non-critical wear zones (note: lower wear resistance than HARDFACE HC-O). After welding, run a capping weld (seal pass) along the joint line on the hardfaced surface to restore full protection. When joining WA wear plates to • Quenched & tempered steels • Structural steel • Stainless steel Weld is joined up to the interface between the base plate and overlay. Fill the rest of the gap with: HARDFACE HC-O HARDFACE L-O HARDFACE CNV-O Refer to Table 8 for guidance on which capping material suits which plate. A B Secondary Material Welding Alloys wear plate Shell Material Secondary Material Welding Alloys wear plate Shell Material C Table 7: Colour code legend Wear Plate - Base material Wear Plate - Hardfaced layer Joining welds Hardface Capping Shell & Secondary material Table 6: Joining consumables WA TRI S 307-O WA HARDFACE 19 9 6-O WA TRI S 309L-O WA TRI S 312-O WA HARDFACE AP-O WA HARDFACE NM-O Table 8: Typical capping materials Hardplate™ 100S HARDFACE HC-O Hardlite™ HARDFACE HC-O Hardplate™ 300S HARDFACE CN-O Hardplate™ 600S HARDFACE CNV-O Tuffplate™ S HARDFACE TIC-O
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