焊(han)(han)(han)縫(feng)(feng)(feng)(feng)處理:如間隙(xi)過(guo)(guo)大，則(ze)造成(cheng)鄰近(jin)效應減少(shao)，渦流(liu)熱量(liang)不足，焊(han)(han)(han)縫(feng)(feng)(feng)(feng)晶(jing)間接合不良而(er)產(chan)(chan)生(sheng)未熔合或(huo)開(kai)裂。如間隙(xi)過(guo)(guo)小則(ze)造成(cheng)鄰近(jin)效應增大，焊(han)(han)(han)接熱量(liang)過(guo)(guo)大，造成(cheng)焊(han)(han)(han)縫(feng)(feng)(feng)(feng)燒損;或(huo)者焊(han)(han)(han)縫(feng)(feng)(feng)(feng)經擠(ji)(ji)壓(ya)(ya)(ya)、滾壓(ya)(ya)(ya)后形(xing)成(cheng)深坑，影響焊(han)(han)(han)縫(feng)(feng)(feng)(feng)表(biao)面質量(liang)。將管坯的兩個邊緣加熱到焊(han)(han)(han)接溫度(du)后，在擠(ji)(ji)壓(ya)(ya)(ya)輥的擠(ji)(ji)壓(ya)(ya)(ya)下(xia)，形(xing)成(cheng)共同(tong)的金(jin)屬晶(jing)粒互相滲透、結晶(jing)，終形(xing)成(cheng)牢固的焊(han)(han)(han)縫(feng)(feng)(feng)(feng)。螺旋(xuan)鋼(gang)管若擠(ji)(ji)壓(ya)(ya)(ya)力(li)過(guo)(guo)小，形(xing)成(cheng)共同(tong)晶(jing)體的數量(liang)就(jiu)小，焊(han)(han)(han)縫(feng)(feng)(feng)(feng)金(jin)屬強(qiang)度(du)下(xia)降(jiang)，受力(li)后會(hui)產(chan)(chan)生(sheng)開(kai)裂;如果擠(ji)(ji)壓(ya)(ya)(ya)力(li)過(guo)(guo)大，將會(hui)使熔融(rong)狀態(tai)的金(jin)屬被擠(ji)(ji)出焊(han)(han)(han)縫(feng)(feng)(feng)(feng)，不但降(jiang)低了焊(han)(han)(han)縫(feng)(feng)(feng)(feng)強(qiang)度(du)，而(er)且會(hui)產(chan)(chan)生(sheng)大量(liang)的內外毛刺，甚至造成(cheng)焊(han)(han)(han)接搭縫(feng)(feng)(feng)(feng)等缺陷。

受壓(ya)(ya)容(rong)器(qi)的(de)(de)強(qiang)度(du)檢驗(yan)(yan)(yan)(yan)(yan)：受壓(ya)(ya)容(rong)器(qi)，除(chu)進(jin)行密(mi)封(feng)性試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)外，還(huan)要進(jin)行強(qiang)度(du)試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)。常(chang)見有水(shui)壓(ya)(ya)試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)和(he)氣(qi)壓(ya)(ya)試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)兩種。它們都能檢驗(yan)(yan)(yan)(yan)(yan)在壓(ya)(ya)力下工作的(de)(de)容(rong)器(qi)和(he)管道的(de)(de)焊(han)(han)縫(feng)致(zhi)密(mi)性。氣(qi)壓(ya)(ya)試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)比水(shui)壓(ya)(ya)試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)更為靈敏和(he)速，同(tong)時試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)后的(de)(de)產(chan)品不用(yong)排水(shui)處理(li)，對于排水(shui)困(kun)難的(de)(de)產(chan)品尤為適用(yong)。但試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)的(de)(de)危險性比水(shui)壓(ya)(ya)試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)大(da)。進(jin)行試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)時，必須遵守相應(ying)的(de)(de)技術(shu)措(cuo)施，以防試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)過程中發(fa)生(sheng)事故。致(zhi)密(mi)性檢驗(yan)(yan)(yan)(yan)(yan)：貯存(cun)液體或氣(qi)體的(de)(de)焊(han)(han)接容(rong)器(qi)，其焊(han)(han)縫(feng)的(de)(de)不致(zhi)密(mi)缺陷，如貫(guan)穿性的(de)(de)裂紋、氣(qi)孔、夾渣、未焊(han)(han)透和(he)疏(shu)松組(zu)織等(deng)(deng)，可(ke)用(yong)致(zhi)密(mi)性試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)來發(fa)現。致(zhi)密(mi)性檢驗(yan)(yan)(yan)(yan)(yan)方法有：煤油(you)試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)、載水(shui)試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)、水(shui)沖試(shi)(shi)(shi)(shi)(shi)(shi)驗(yan)(yan)(yan)(yan)(yan)等(deng)(deng)。