| 摘要 |
PURPOSE:To execute hot joining of steel products as simply and efficiently as possible and to obtain high strength of joining. CONSTITUTION:The local parts of >=30% of the width inclusive of both end faces of the joint parts of the hot steel products are heated and joined in a reducing atmosphere in the method for superposing or butting the steel products to each other and joining these steel products. This hot joining method for the steel products consists in executing the heating by the reducing flames burned under the conditions under which the following equations (I) and (II) are simultaneously satisfied: p>=214m-75... equation I, p>=-150m+90... equation II, where (p) is the degree of oxygen enriching (oxygen ratio in the air for combustion, vol.%) in the air for combustion; (m) is the ratio of the oxygen quantity to be actually used to the oxygen quantity necessary for complete combustion of fuel. As a result, the good joining is executed even if prior descaling is not executed. |
