chromium carbide overlay plate wear resistant parts can be fabricated by casting process and welding process. If we fix a wear resistant part by re-manufacturing hardfacing engineering, then we can get a much more wear-resistant part than the original casting part. Hardfacing repair is a re-manufacturing process that can realize the recycling economy by making good use of waste materials.

Hardfacing is the microscopic casting

For the tonnage, hardfacing is still very much a casting process, welding parts accounted for a relatively small proportion. Casting has developed earlier than hardfacing, so we always asked if hardfacing can take the place to casting since the birth of it, but in fact, by theory says, the two process can not substitute each other. We think, surfacing process is actually a micro casting process, if the casting can be regarded as a large size molten pool in meters units, then welding would be a small molten pool in millimeters. Ok, now why we said hardfacing is the microscopic casting ? Actually, there will be much more difficulties in manufacturing and heat treatment with the continuous increase of the casting dimensions, and it will be very difficult to ask chromium carbide wear resistant part has an uniform wear resistance from inside to outside. But the welding process do can solve this problem,it makes the whole casting process microcosmic and micronized by dividing the big casting into numerous small castings, then each micro molten pool can easily reach the final work-piece required strength, hardness, toughness and other microscopic indexes.

So, casting and welding goes together during the welding process,if we has a high quality requirements on a work-piece, both casting and welding should has a high quality.