diff --git a/SGGL/FineUIPro.Web/HJGL/WeldingManage/WeldReportEdit.aspx.cs b/SGGL/FineUIPro.Web/HJGL/WeldingManage/WeldReportEdit.aspx.cs
index 8344c42a..b23ca5a5 100644
--- a/SGGL/FineUIPro.Web/HJGL/WeldingManage/WeldReportEdit.aspx.cs
+++ b/SGGL/FineUIPro.Web/HJGL/WeldingManage/WeldReportEdit.aspx.cs
@@ -1158,7 +1158,11 @@ namespace FineUIPro.Web.WeldingProcess.WeldingManage
                 for (int i = 0; i < selectedRowId.Count(); i++)
                 {
                     string weldTaskId = selectedRowId[i];
-                    BLL.WeldTaskService.UpdateWelderTask(weldTaskId, drpCanWelder.SelectedValue);
+                    var weldTask = BLL.WeldTaskService.GetWeldTaskById(weldTaskId);
+                    if (weldTask != null && string.IsNullOrEmpty(weldTask.CoverWelderId) && string.IsNullOrEmpty(weldTask.BackingWelderId))
+                    {
+                        BLL.WeldTaskService.UpdateWelderTask(weldTaskId, drpCanWelder.SelectedValue);
+                    }
                 }
                 this.BindGrid(null);
                 this.Grid1.SelectedRowIDArray = selectedRowId;