diff --git a/HJGL_DS/BLL/API/APIWeldServices.cs b/HJGL_DS/BLL/API/APIWeldServices.cs
index 8b3b19a..a346670 100644
--- a/HJGL_DS/BLL/API/APIWeldServices.cs
+++ b/HJGL_DS/BLL/API/APIWeldServices.cs
@@ -407,16 +407,21 @@ namespace BLL.API
         /// </summary>
         /// <param name="projectId"></param>
         /// <returns></returns>
-        public static Model.ResponeData getProjectWelder(string projectId)
+        public static Model.ResponeData getProjectWelder(string projectId, string unitId, string date)
         {
             Model.ResponeData respone = new ResponeData();
             using (Model.SGGLDB db = new Model.SGGLDB(Funs.ConnString))
             {
+                DateTime dateTime =DateTime.Parse("1000-10-10");
+                if (!string.IsNullOrEmpty(date) && date != "null")
+                {
+                      dateTime = DateTime.Parse(date); 
+                }
                 var q = from pw in db.Project_Welder
-                        join w in db.HJGL_BS_Welder on pw.WED_ID equals w.WED_ID
-                        where pw.ProjectId == projectId
-                        where w.PhotoUrl !=null && pw.ExchangeTime ==null
+                        join w in db.HJGL_BS_Welder on pw.WED_ID equals w.WED_ID 
+                        where w.PhotoUrl !=null && pw.ExchangeTime > dateTime
                         select w;
+             
                 List<WelderItem> res = new List<WelderItem>();
                 foreach (var p in q)
                 {
diff --git a/HJGL_DS/FineUIPro.Web/common/WelderManage/WelderSave.aspx.cs b/HJGL_DS/FineUIPro.Web/common/WelderManage/WelderSave.aspx.cs
index 1968e8f..ebb145f 100644
--- a/HJGL_DS/FineUIPro.Web/common/WelderManage/WelderSave.aspx.cs
+++ b/HJGL_DS/FineUIPro.Web/common/WelderManage/WelderSave.aspx.cs
@@ -415,7 +415,7 @@
                 var pw = Funs.DB.Project_Welder.Where(x => x.WED_ID == WED_ID);
                 foreach(var w in pw)
                 {
-                    w.ExchangeTime = null;
+                    w.ExchangeTime = DateTime.Now;
                 }
                 Funs.DB.SubmitChanges();
                 Alert.ShowInParent(PersonFace(welder), MessageBoxIcon.Warning); 
diff --git a/HJGL_DS/WebAPI/Controllers/WeldController.cs b/HJGL_DS/WebAPI/Controllers/WeldController.cs
index ab5dc9f..1e9ee17 100644
--- a/HJGL_DS/WebAPI/Controllers/WeldController.cs
+++ b/HJGL_DS/WebAPI/Controllers/WeldController.cs
@@ -179,15 +179,14 @@ namespace WebAPI.Controllers
 
         }
 
-
         [HttpGet]
-        public Model.ResponeData getProjectWelder(string projectId)
+        public Model.ResponeData getProjectWelder(string projectId, string unitId, string date)
         {
             Model.ResponeData respone = new ResponeData();
             try
             {
 
-                return APIWeldServices.getProjectWelder(projectId);
+                return APIWeldServices.getProjectWelder(projectId, unitId, date);
             }
             catch (Exception e)
             {
@@ -196,6 +195,7 @@ namespace WebAPI.Controllers
             }
             return respone;
         }
+  
         [HttpGet]
         public Model.ResponeData getUpdateWelderExchangeTime(string wedId,string projectId)
         {