Problems in laser repair-welding a surface-treated tool steel

被引：30

作者：

Vedani, M.

Previtali, B.

Vimercati, G. M.

Sanvito, A.

Somaschini, G.

机构：

[1] Politecn Milan, Dipartimento Meccan, I-20156 Milan, Italy

[2] Sanvito & Somaschini SpA, I-20055 Renate, MI, Italy

[3] Utensiltempra SrL, I-20045 Besana In Brianza, MI, Italy

来源：

SURFACE & COATINGS TECHNOLOGY | 2007年 / 201卷 / 08期

关键词：

X] nitrided tool steel; X] chrome plated tool steel; X] laser repairing welding;

D O I：

10.1016/j.surfcoat.2006.09.051

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A research work is described on the development of defects in laser repair welding of a surface-treated tool steel. Repair welding tests were carried out on plasma-nitrided and on chrome-plated type 1.2738 steel plates. Welding defects in the chrome-plated samples were mainly due to chrome and oxygen overalloying of the weld metal, leading to extensive hot cracking. Cracks of the surface chrome deposit in the HAZ due to welding stresses were also detected. In the nitrided samples, welding resulted in the copious formation of gas pores due to nitrogen release during weld metal solidification. A procedure for combined laser pre-treating and laser welding of the nitrided samples was thus presented. The procedure is aimed at minimising the negative effect of the laser beam on the structural integrity of the base and welded material. The results of the microstructural analyses revealed that a significant reduction in defects could be achieved by the proposed method in the nitrided samples. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：4518 / 4525

页数：8

共 24 条

[1]

BAUMERT KL, 1994, MATER PERFORMANCE, V33, P45

[2] The influence of operator skills, process parameters and materials on clad shape in repair using laser cladding by wire [J].